Poseidon Outer Great Barrier Reef Snorkeling and Diving Cruise from Port Douglas
Overview
Available languages
8 hours
Mobile ticket
Departing from Port Douglas, Poseidon is a 24 metre
catamaran offering an exciting boutique adventure, perfect
for small groups of experienced divers and confident
snorkellers. With access to exclusive remote reef sites,
expert marine interpretation and citizen science, guest
numbers are capped at 65. Poseidon visits 3 different sites
in one day at the stunning Agincourt ribbon reefs. Certified
divers can enjoy up to 3 dives and introductory diving is also
available. With marine biologist interpretation at each site,
snorkellers have the opportunity to participate in a
monitoring survey. Poseidon has a special permit allowing
guests to swim with dwarf minke whales if encountered.
Additional Info
Service animals allowed
Specialized infant seats are available
Not recommended for travelers with poor cardiovascular health
Travelers should have at least a moderate level of physical fitness
Vegetarian option is available, please advise at time of booking if required
Please advise any specific dietary requirements at time of booking
Please bring towel, swimmers, sunscreen and hat
Minimum age for diving is 12 years
Scuba Diving guidelines for 'flying': If only one dive is undertaken then a minimum of 12 hours is recommended before flying (to an altitude of 300 metres or greater). If doing multiple dives, an interval of 24 hours is recommended
Cancellation Policy
For a full refund, cancel at least 24 hours before the scheduled departure time.
What‘s Included
Guided snorkel tour with marine biologist
Hotel pickup and drop-off (Hotels in the Port Douglas area only)
Reef interpretation talk
Buffet lunch
Use of Snorkelling equipment
Environmental Management Charge
Morning tea, coffee and cake, focaccia on boarding, Afternoon tea
Morning and afternoon tea
Drinks (available for purchase on board)
Hotel pickup and drop-off from hotels outside the Port Douglas area
What To Expect
Poseidon Outer Reef Cruises
Cruising from Port Douglas aboard the modern high speed dive and snorkel catamaran Poseidon, you’ll have more time to spend at three fabulous snorkeling and diving sites on Agincourt Reef’s outer limits. Renowned for its coral and marine life, the reef is known for being the best diving and snorkeling day trip destination from Port Douglas. This cruise suits experienced divers and beginners alike, whether you’re a certified diver or you just want to go snorkeling. If you’re a diver, you can take up to three dives into the Great Barrier Reef’s coral gardens. You have your choice of diving from the mooring site, doing a drift drive back to the vessel or taking an excursion to less easily accessed sites depending on the conditions of the day.
Great Barrier Reef
If you’d prefer to stay on top of the water, go snorkeling in sheltered lagoons with breathtaking drop-offs. Learn about the Great Barrier Reef’s fragile ecosystem during a reef interpretation talk, and then take a guided snorkel tour for an informed look at the reef’s tropical fish and coral. Poseidon has been specially designed to enhance your snorkeling and diving adventure with a lowering transom for easier access to the water, an air-conditioned saloon and open deck areas for relaxing on the reef. You’ll also have plenty of chances to hydrate and re-fuel with an included morning tea, afternoon tea and buffet lunch with prawns.
Options
SNORKEL 15%
15% OFF Snorkel: Snorkeling equipment including lycra suit, morning/afternoon tea, hot and cold buffet lunch & guided snorkel tour.
SNORKEL ONLY
Snorkel: Snorkeling equipment including lycra suit, morning/afternoon tea, hot and cold buffet lunch & guided snorkel tour.
SNORKEL + 1 INTRO DIVE
One Intro Dive: Includes snorkeling gear, guided snorkeling tour, lunch and one introductory dive with all dive gear and wetsuit included
SNORKEL + 2 CERTIFIED DIVES
Two Certified Dives: Includes snorkeling gear, guided snorkeling tour, lunch. two certified dives with all dive gear and wetsuit included
SNORKEL + 1 CERTIFIED DIVE
One Certified Dive: Includes snorkeling gear, guided snorkeling tour, lunch. one certified dive with all dive gear included
SNORKEL + 3 CERTIFIED DIVES
Three Certified Dives: Includes snorkeling gear, guided snorkeling tour, lunch. Three certified dives with all dive gear and wetsuit included
SNORKEL + 2 INTRO DIVES
Two Intro Dives: Includes snorkeling gear, guided snorkeling tour, lunch and two introductory dives with all dive gear and wetsuit included
Reviews
98 reviews
Total reviews and rating from Viator & Tripadvisor
Top class
168justep,
Nov 21, 2025
- Review from Tripadvisor
5.00Wow! What a superb experience. And Lucy (ocean ecologist) she was absolutely incredible. The crew in general was great: good vibes, high alert, helpful, professional and motivated. Loved all the details, we were safe, informed, catering was really nice (did not expect so much food😆). 100% recommended.
Brilliant day out with Gordon!
Tor P,
Nov 17, 2025
- Review from Tripadvisor
5.00Booked on to do one certified dive but ended up doing all 3! Felt a bit nervous as hadn’t done a dive in a while but Gordon was super friendly and guided me through! Definitely up there with one of the best experiences I have done! Would recommend!
Wonderful Experience Combining Fun and Safety
PeterC124,
Nov 11, 2025
- Review from Tripadvisor
5.00Had a wonderful experience on board Poseidon for introductory diving and snorkeling on the outer reef. The entire crew were very profession and created a perfect blend of fun and safety. Was so impressed the first day that I went back for a second day with a friend. Special thanks to Moni and Joe who taught me how to dive and made me feel safe (even after making dumb mistakes). Because I felt safe I had an incredibly enjoyable experience and now seem to be addicted to diving. It will be my new hobby (as a 66 year old beginner)!! I fully recommend the Poseidon cruise for your Great Barrier Reef adventure.
Finding Nemo by Walt Disney - is here!
Natalie S,
Oct 25, 2025
- Review from Tripadvisor
4.00As I awaited the gruelling boat journey out to sea on a cramped timber seat. After I had got up early! I remember feeling rather forlorn, like another old reef adventure, is about to begin. But Poseidon must have been watching over us! Pretty soon I heard people cheering whilst snorkelling, sharing stories with strangers on board about what they saw and taking under water photos, and chatting excitedly. I soon realised this was no ordinary reef tour! I was not disappointed because once I got use to the idea of being in a wet lycra sting suit and getting acquainted with my fins and snorkel at three separate sites! Each rather unique and beautiful display was perfick and beautiful. The team on board Poseidon were work health and safety experts keeping us informed throughout the day. Alicia asks, ‘are you ok?’ ‘If I swim to you and ask if your ok - just do this unicorn sign above your head and I know your ok’, ‘who wants to come on a tour with me, by a marine biologist hands up’ ‘just be careful of that side of the boat where the current is stronger there’ ‘try swimming over there if you want to see…’, ‘this fish is a…’ ‘Just like the aboriginal word..’ ‘this is how coral gets its colour’! ‘If you need help with your equipment just ask me’ and ‘this is how coral reefs are made’’it looks like we have come across a…’, ‘these are the cucumbers who make our sand white without them..’ And ‘Finding Nemo’ by Walt Disney - definitely a good film is truly alive on this tour! And out there (on the Great Barrier Reef) - anything is possible. All members on board were pleasantly surprised by the chosen sites. The only thing I got worried about was a small fishing boat visiting the area we were about to anchor - I got the impression they were pushing boundaries. There is so much to see! The team of attentive young people who put people’s safety first, are impressive. Alicia reminds me of the late Jane Goodall, but totally immersed in the marine biologist space, so listen carefully, and get out there people!
Amazing day out
107kaisut,
Oct 17, 2025
- Review from Tripadvisor
5.00Thank you amazing crew at Poseidon. Fun, light, helpful, informative and professional. We felt incredibly welcome and looked after. Food was delicious and sites calm even though seas were rough. Special thanks to Gordon for his calmness and kindness, making me comfortable after too long a break in diving. Much recommended!!
Unforgettable snorkeling!...
Michelle M,
Oct 10, 2025
- Review from Viator
5.00Unforgettable snorkeling! The Poseidon was the perfect sized boat tour (~50 people) to where we felt we could enjoy the great barrier reef without bumping snorkels. They had a marine biologist onboard who did little lessons and took you fish counting! The reef is absolutely stunning and you will see it up VERY close. Nothing compares to this color and expansive coral and fish species (along with turtles, reef sharks, etc). The staff was extremely helpful and kind and the meal was good.
Excellent snorkelling trip to 3 different sites with local pickup and drop off.
Keca66,
Oct 10, 2025
- Review from Tripadvisor
5.00We chose this trip in preference to the large ones that go to a pontoon on the GBR. We're glad we did. This is a smaller boat (max 75) that took us to three different dive/snorkelling sites away from the masses. Where you go is up to the Captain on the day, but if ours was anything to go by you will not be disappointed. All the staff go out of their way to make this a fun and memorable trip. Both snorkellers and divers are on the trip, but while the divers were preparing, the snorkellers would get the Marine Biologist (Glen) on board explaining what we could see at each site and would be in the water explaining what could be seen and also the health of the reef. Morning coffee, buffet lunch and afternoon tea are all included and if you contact them in advance and are in the Port Douglas area, pick-up and drop off is also included. Special mention to Scotty who made the obligatory Health & Safety talk so entertaining, that I still remember it! You couldn't switch off from what he was saying. All equipment is provided, mask, snorkel, fins and stinger suit. All you need is a towel and camera. One piece of advice, wear outer clothes that you don't mind getting wet as there are no lockers or changing rooms on board, just 2 toilets that you could change in if necessary. All in all, an excellent trip and we're glad we picked Poseidon over the pontoon one that we were also looking at.
Fantastic day with Poseidon Outer Reef Cruises
ChristophS2565,
Oct 7, 2025
- Review from Tripadvisor
5.00I had a wonderful experience diving with Poseidon. The crew was outstanding – extremely professional, friendly, and helpful throughout the entire day. Everything was very well organized, from the safety briefing to the dives themselves. We did three great dives at beautiful reef sites with excellent visibility. The equipment was in top condition and the whole trip felt safe and well managed. Highly recommend Poseidon for anyone wanting a quality Great Barrier Reef experience with an exceptional team!
Great Diving experience
Paradise04573430062,
Sep 21, 2025
- Review from Tripadvisor
5.00We booked a full day of diving for three people on the Great Barrier Reef with Poseidon Dive Company. The day included three full dives and it was absolutely brilliant. Everything was spot-on – from the pick-up and transport, to the service, the care, the professionalism, and the friendly vibe the whole team created for us. If you’re thinking of booking with them – which we highly recommend – make sure you ask to dive with Gordon. He’s a fantastic Aussie instructor, caring, supportive, and he guided us the whole day with patience and good energy. For anyone looking for a dive operator on the Reef, we can’t recommend Poseidon highly enough. Thanks to the entire crew – it was perfect from start to finish.
Amazing
544milif,
Sep 8, 2025
- Review from Tripadvisor
5.00We went out in Poseidon twice to scuba dive and had a great time despite some rough weather. We did 3 dives on each trip, and had our excellent guide Gordon for all 6 dives. We got to see some incredible sea life and coral under Gordon’s guidance, including a number of white tip reef sharks, little rays, cuttlefish to name a few. Gordon was very experienced and made us feel comfortable on our first dive in over a year. We couldn’t recommend this experience enough, the staff were super helpful and knowledgeable, and there was plenty of food to keep us going. A must do in port douglas
From A$267.75
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