Every boat that leaves Port Douglas for the day sells itself as a Great Barrier Reef tour, but they go to two very different places. The outer reef boats run to the Agincourt Ribbon Reefs and the reefs around them on the edge of the continental shelf, which Quicksilver puts at 72 kilometres offshore. The Low Isles boats run about 15 kilometres north-east to Low Isles, which the Great Barrier Reef Marine Park Authority describes as a 1.6 hectare vegetated coral sand cay and a mangrove cay joined by a reef. Wavedancer, one of the Low Isles boats, calls it an inshore reef on its own website, and that is the honest label.
Neither is the wrong choice. Low Isles is a short, calm crossing to a beach you snorkel from, with turtles, a lighthouse and lunch, and it suits children, nervous swimmers and anyone prone to seasickness. The outer reef is a longer crossing to clearer, deeper water and the coral most people picture when they think of the Great Barrier Reef. The prices overlap more than you would expect, and the cheapest way onto each depends on where you book. We read every fare, timetable and condition on the operators' own websites and booking engines and on our booking partner on 31 October 2026.
Two different reefs, not two grades of one
Low Isles sits inside the shipping channel, about 15 kilometres north-east of Port Douglas. It is two islands on one reef: Low Island, the small sand cay with the lighthouse, and Woody Island, a mangrove island that is the larger of the two. The cay is ringed by roughly 55 acres of reef, by Wavedancer's and Calypso's figures, and the lagoon is shallow enough to wade into from the beach. It is a Marine National Park (green) zone, so there is no fishing and no motorised water sports, and visitors may only be on the island between sunrise and sunset. About 50,000 people a year visit, according to the Marine Park Authority.
The outer reef is the line of ribbon reefs on the edge of the continental shelf, the Agincourt reefs being the ones the Port Douglas boats use most. Water there is further from river runoff, which is the main difference you will see. The Australian Institute of Marine Science says of inshore reefs that high levels of suspended sediment from rivers mean water clarity is often reduced, and Wavedancer's own page on Low Isles says the same thing in its own words: inshore reefs are naturally exposed to more nutrients, fine sediment and lower water clarity, and cyclones and floods can shift the reef's make-up dramatically.
So the honest comparison is not better and worse coral. It is a sheltered beach with turtles and coral close to shore, against open water, more visibility and bigger reef structures, reached by a longer and often rougher crossing.
What the coral looks like now
Two of the Low Isles operators say plainly that the reef is not at its best. Calypso's booking page tells guests that the reef shows some damage from Cyclone Jasper at Low Isles plus some freshwater bleaching from the flooding, and Reef Sprinter's site says the Low Isles snorkelling area suffered some damage in the shallow water from Cyclone Jasper on 13 December 2023. Sailaway's FAQ notes that bleaching has affected parts of the reef in general terms; Wavedancer's pages say nothing about current condition. We found no government survey of the coral at Low Isles itself since the cyclone, so we cannot put a number on it.
The wider picture is better than the headlines from 2024 and 2025. The Australian Institute of Marine Science's 2025 to 2026 summary, from surveys between August 2025 and June 2026, puts average hard coral cover in its Central region, which runs from Cooktown to Proserpine and includes Port Douglas, at 31.6 percent, up from 28.6 percent the year before and above the long-term average of 20 percent. It found only limited impact from the 2025 bleaching. That figure covers reefs across the region and does not single out inshore reefs like Low Isles, so read it as the state of the reef in general, not of the lagoon you will snorkel.
What each Low Isles day costs, all in
Four companies run shared trips to Low Isles from the Crystalbrook Marina in Port Douglas. They differ in boat size, time on the island and what the fare covers far more than in price, and on two of them where you book changes the price.
Wavedancer, Quicksilver's 30 metre sailing catamaran, lists A$276 an adult, A$148 a child aged 4 to 14 and A$710 for a family of four, valid to 31 March 2027. Its own website runs a 15 percent sale for travel between 6 August 2026 and 31 March 2027, and its booking engine took A$41.40 off an adult fare on the day we checked, A$234.60, and A$603.50 for the family pass. Our booking partner sells the same day at A$276, with a separate '15% off' option at A$234.60 only for bookings made by 8 November 2026. After that date Wavedancer is cheaper booked direct, and we would rather tell you so. There is no fuel surcharge on Wavedancer and the reef charge is in the fare, but hotel transfers are extra: A$26 return from Port Douglas or A$45 from Cairns for an adult.
Sailaway sells the dearest Low Isles day, A$365 an adult, A$255 a child aged 4 to 12 and A$1,116 for a family, the same at our link and direct, valid to 31 March 2027 with the reef charge included. For that you get the longest time on the island, 4.5 hours, on a boat that takes at most 33 guests, plus the courtesy coach from Port Douglas accommodation, which must be pre-booked, morning and afternoon tea and a buffet lunch. Its afternoon trip with a sunset sail home is the same price and includes drinks and canapes, but you get much less island: the page says three hours and its own timetable shows about two and a half.
Calypso's half day is a different shape: a 12 metre motor catamaran carrying 23 guests, a 30 minute crossing and 2.5 hours at the island, morning (boarding 7.15am, back 11.30am) or afternoon (boarding 1pm, back 5.15pm). It is A$246 an adult and A$201 a child aged 4 to 14 off peak, which runs to 18 December 2026 and again from 18 January 2027, and A$267 and A$211 in the peak weeks between. Lunch is not included, only morning or afternoon tea, and there are no transfers. Calypso's homepage says peak rates attract an extra A$10 a person, but its Low Isles page charges adults A$21 more, so expect the higher figure. Our link charges the same as the operator.
Reef Sprinter is a 14 passenger speedboat. Its Island and Lagoon trip is A$230 an adult and A$190 a child aged 3 to 14 for 3.5 hours with up to 2.5 hours on the island. Its cheaper A$180 trip snorkels the Low Isles reef from the boat and does not land on the island. It does not take infants and does not run transfers from Cairns or Palm Cove. It is not sold through our booking partner, so we earn nothing if you choose it.
- Wavedancer full day: A$234.60 direct with the 15% sale to 31 Mar 2027 (A$276 standard; A$234.60 at our link only for bookings made by 8 Nov 2026); lunch included; coach A$26 return extra
- Sailaway full day: A$365 at our link and direct; 4.5 hours at the island; lunch and Port Douglas coach included
- Sailaway afternoon and sunset: A$365; about 2.5 hours at the island; light lunch, canapes and drinks included
- Calypso half day: A$246 off peak, A$267 peak; 2.5 hours at the island; no lunch, no transfers
- Reef Sprinter Island and Lagoon: A$230; up to 2.5 hours on the island; 14 passengers; not on our booking partner
And what the outer reef costs
Among the five outer reef boats on our Port Douglas ranking (the sixth, Wavedancer, goes to Low Isles), the lowest adult fare on the operators' own pages is Calypso's snorkel trip at A$319 an adult off peak (A$329 in peak weeks), the same at our link, with no fuel levy. Silversonic is A$328 an adult with a A$10 fuel surcharge added at booking, and choosing a Port Douglas hotel pickup in its booking engine added nothing to the price. Quicksilver's pontoon day is A$338 plus the same A$10 fuel surcharge, and its fare excludes both the guided snorkel tour, an A$89 extra, and the A$26 return coach. Sailaway's sailing day to Mackay Cay on the outer reef is A$370, with the coach included.
Put side by side, the gap is smaller than the distance suggests. Wavedancer booked direct with its coach comes to A$260.60 an adult, and Calypso's outer reef snorkel day is A$319. Sailaway's Low Isles day is A$365 and its outer reef day A$370, A$5 apart on the same company's boats. If the price is the reason you are leaning towards Low Isles, check the outer reef fare for your dates first. Our ranking of the six Port Douglas reef boats compares the outer reef days in full.
What the brochures leave out
Woody Island is closed until 1 March 2027. The Marine Park Authority closes it each year to protect nesting pied imperial pigeons, from 24 September 2026 this season, and Low Island stays open. The island tours on every boat are therefore of Low Island alone.
On toilets, the operators disagree. Wavedancer's FAQ says there are no toilet facilities on Low Isles; Reef Sprinter's says there is a bathroom on the island. Plan as if Wavedancer is right, and use the boat before the shuttle.
Stinger season runs from November to May, by the Queensland Government's guidance, and that is now. Wavedancer and Calypso include lycra suits in the fare, and Sailaway hands them out to every guest from about November to May.
You do not need to be a strong swimmer for Low Isles, but you do need to swim. Sailaway says guests who cannot swim are generally not allowed in the water to snorkel and asks every snorkeller to complete a medical declaration. Wavedancer supplies buoyancy vests and flotation noodles. Every Wavedancer snorkel, including the guided tour, starts from the beach rather than the boat.
The same company owns boats on both sides of this decision. Wavedancer, Quicksilver and Silversonic are all part of the Quicksilver Group, and Calypso, part of the Experience Co group, sells both a Low Isles half day and an outer reef day. Sailaway, trading as JB Sailaway Pty Ltd under the Journey Beyond group, also sells both.
So which one?
Choose Low Isles if you are travelling with young children, anyone who has never snorkelled or anyone who gets seasick, if you would rather spend the day on a beach than on a deck, or if you want turtles more than coral walls. The cheapest good full day is Wavedancer booked direct at A$234.60 while its sale runs; Sailaway at A$365 buys you a smaller boat, more time on the island and the coach; Calypso's half day suits a morning before a Daintree afternoon.
Choose the outer reef if the coral is the point of the trip, if you are a confident swimmer, or if you only have one reef day in your life and want the version of the reef in the photographs. It costs from A$319 at Calypso, the crossing is longer and the water is more exposed, and you should take a seasickness tablet before you board.
If you are still torn, compare Sailaway's two days: A$365 to Low Isles and A$370 to Mackay Cay on the outer reef, from the same company, both with the coach included. When the price is effectively the same, the choice comes down to how comfortable you are in open water.
Details change. We verify every price, duration, departure point and inclusion against the operator's own website, and we date every check, but operators can change them at any time without notice. Always confirm the details that matter to you with the operator before you book.
Good to know
Is Low Isles part of the Great Barrier Reef?
Yes. Low Isles lies inside the Great Barrier Reef Marine Park, about 15 kilometres north-east of Port Douglas, and its waters are a Marine National Park (green) zone. It is an inshore reef rather than the outer reef: the outer reef boats from Port Douglas run to the ribbon reefs on the edge of the continental shelf, which Quicksilver puts at 72 kilometres offshore.
Is Low Isles or the outer reef better for snorkelling?
The outer reef has clearer water and larger reef structures, because it sits far from river runoff; the Australian Institute of Marine Science says water clarity on inshore reefs is often reduced by suspended sediment. Low Isles is easier: you snorkel from a sheltered beach after a short crossing, and the operators say green turtles are seen there most days. Calypso and Reef Sprinter both say the shallow coral at Low Isles still shows damage from Cyclone Jasper in December 2023.
How much is a Low Isles tour from Port Douglas?
On 31 October 2026: Wavedancer A$276 an adult, or A$234.60 booked direct under its 15 percent sale to 31 March 2027 (plus A$26 for the return coach); Calypso's half day A$246 off peak or A$267 in peak weeks; Reef Sprinter's island trip A$230; and Sailaway's full day or afternoon sunset trip A$365, with the coach from Port Douglas accommodation included.
Is it cheaper to book Wavedancer direct?
From 9 November 2026, yes. Wavedancer's own booking engine took 15 percent off, A$234.60 an adult, for travel to 31 March 2027. Our booking partner charges A$276, with a '15% off' option at A$234.60 that is offered only for bookings made by 8 November 2026. Booked at our link you can cancel for a full refund up to 24 hours before departure.
How long does it take to get to Low Isles?
About 30 minutes on Calypso's half day boat, about an hour on Sailaway's full day trip, and 75 minutes each way by Wavedancer's own timetable, though its homepage calls it an hour's sail. The outer reef is a longer crossing on every boat.
Can you walk around Low Isles?
Around Low Island, yes: every full and half day trip includes a guided walk, and you can see the lighthouse, first lit in 1878 and automated in 1993, though the tower itself is not open. Woody Island, the mangrove island, is closed from 24 September 2026 to 1 March 2027 for nesting pigeons, and visitors are allowed on Low Island only between sunrise and sunset.
Are there toilets on Low Isles?
The operators disagree. Wavedancer says there are no toilet facilities on Low Isles; Reef Sprinter says there is a bathroom on the island. Every boat that stays for the day has toilets on board, so use them before you go ashore.
Is Low Isles good for children?
It is the easier of the two reef days for children: a short crossing, a beach to snorkel from and a lagoon shallow enough to stand in. Wavedancer and Calypso charge children aged 4 to 14 as children and take under fours free; Sailaway's child fare covers ages 4 to 12. Reef Sprinter does not take infants.