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
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 + 2 CERTIFIED DIVES
Two Certified Dives: Includes snorkeling gear, guided snorkeling tour, lunch. two certified dives with all dive gear and wetsuit included
SNORKEL ONLY
Snorkel: Snorkeling equipment including lycra suit, morning/afternoon tea, hot and cold buffet lunch & guided snorkel tour.
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
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 + 1 CERTIFIED DIVE
One Certified Dive: Includes snorkeling gear, guided snorkeling tour, lunch. one certified dive with all dive gear included
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
Fuel surcharge
Cancellation Policy
For a full refund, cancel at least 24 hours before the scheduled departure time.
Reviews
106 reviews
Total reviews and rating from Viator & Tripadvisor
Wonderful day out with this company
Anne S,Jul 4, 2026
- Review from Viator
5.00Fabulous day out on the outer Great Barrier Reef. Snorkelling sites had an abundance of sea life. Even saw a reef shark in all its beauty. Different options offered to us. You could choose to float around like I did or challenge yourself to further exploration with a guide or do a drift snorkel. Delicious food options and a kind caring crew. Special thanks to Alicia who went above & beyond cleaning up and offering us her expertise. Lots of help was available with equipment. Thank you for a fabulous day on the outer reef. Friendly check in staff too.
Beautiful day in the rainforest
Denise Z,Apr 6, 2026
- Review from Viator
5.00We really had a good time on this excursion. The scenery is second to none, we enjoyed ourselves swimming in a river spot, we also spotted a couple of crocs on the river. Our driver/ guide Mike was a lovely person who also went out of his way to do a quiz for us on the bus! 5 star experience. I highly recommend it if you are interested to enjoy nature. We also had a good lunch with beef, chicken or fish burgers.
Great great barrier reef
steven d,Mar 17, 2026
- Review from Viator
5.00Great snorkeling experience. I am a diver but my friend was not able to dive so I had no buddy so we snorkeled, I was glad because almost everything you see is within 10 feet. They had life jackets and noodles for those that needed but it was a great way for people to float and see under the surface The coral was amazing, all the different types and colors. The staff was very helpful and they had a ocean biologist to give a brief seminar and some guided swims Definitely a must do tour with a great company
Really great.
Carole V,Feb 9, 2026
- Review from Viator
5.00Really great and well supervised. Had the choice between snorking or bottled. The view of the fish and corals is extraordinary.
Amazing snorkeling, great...
Anonymous,Jan 2, 2026
- Review from Viator
5.00Amazing snorkeling, great crew and even the food was good. Highly recommend this experience to anyone who wants to see the Great Barrier Reef!
Must do
Janice F,Jan 2, 2026
- Review from Viator
5.00The crew is very kind and knowledgeable. The sights are beautiful. We had a perfect weather day during wet season. We all had a great time.
10 / 10 make sure you see the reef with this crew
hannahhW7899KH,Dec 28, 2025
- Review from Tripadvisor
5.00The crew on board the Poseiden were fantastic and there at every step to make sure our day on the reef was spectacular. I can't recommend this highly enough to anyone visiting Port Douglas. The two sites we visited on the reef were rich in coral and different species of fish. We also learned a lot about the area of the reef and were provided with a nice lunch after we were done with snorkelling. It had been a number of years since both my husband and I had snorkelled but the crew had good tips and equipment to help us and others in our group feel safe and confident on the water. Thank you to the Poseiden team!!
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.
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Operated by The Quicksilver Group