• Location: Port Douglas, Australia
  • Duration: 8 hours (approx.)
From USD $ 185.14 View price calendar

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Discover the extraordinary underwater world of Australia’s Great Barrier Reef on this full-day tour of the UNESCO-listed wonder from Port Douglas. Cruise around the Outer Reef in a luxury catamaran and stop along the way to swim or snorkel at some of the reef’s top diving sites. Enjoy a guided snorkelling tour and up to three dives along the Agincourt Reef, with options suitable for certified divers, then refuel with a delicious seafood lunch served on-board.


  • Snorkeling and Diving Cruise to Agincourt Reef from Port Douglas
  • Enjoy more comfort, better service and faster sailing on a luxurious, high-speed catamaran
  • Dine on a seafood buffet lunch, plus morning and afternoon tea
  • Take a guided snorkel tour and listen to a reef interpretative talk, or enjoy a guided dive
  • Snorkel equipment and instruction included
  • Small-group cruise, limited to 80 provides a more personalized experience on the Great Barrier Reef

What You Can Expect

Outer Great Barrier Reef Snorkeling and Diving Cruise from Port Douglas

Great Barrier Reef Snorkeling and Diving Cruise

Customer Reviews

Jo-Dee L

5 star rating: Highly Recommended June 2018

I had a great trip with my 11 year old daughter. The snorkeling with Hayley the marine biologist was the highlight.


5 star rating: Highly Recommended January 2018

This was an amazing experience and was top of my bucket list!! Crew were excellent - great safety training. Kept eyes on us at all times.

Whilst I am a snorkeller - i am usually is calm water. the currents here came in three directions. I was pulled over the reef by one of the crew into a current that would bring me back over the reef so I was able to swim with it whilst exploring the reef. Reef was not as bright as hoped as it wasn't sunny - but I saw many species of brightly coloured fish - too many shapes and patterns of reef to describe and on a second guided swim - on which I was basically towed -my best sighting was a bright blue starfish wriggling around on a reef!!

The lunch was excellent and I was able to buy a glass of vino as we headed back- to celebrate the tick on my bucket list and the most amazing experience ever!!

totally must be done- I'd love to do it again!!


5 star rating: Highly Recommended January 2018

Port Douglas was our last Barrier Reef stop on our cruise ship. I can honestly say that this was the best shore excursion we took. Crew of the Poseidon were excellent and very professional. They wanted to make sure that everyone had a safe and great time. We went on three snorkel trips and each got better as we went along. As I tell everyone, I found Nemo!. Literally saw a family swimming in the reef. Equipment, food and all services were above par. An amazing overall experience and I highly recommend to anyone traveling to Port Douglas in Australia.

Anouska A

5 star rating: Highly Recommended September 2017

Amazing - a must do if one day in this area. Crew were fabulous and the dive sites were fantastic.

Susan H

5 star rating: Highly Recommended August 2017

Oh, I guess I forgot to review this tour last year. But it was fabulous. We were worried, having heard about the continuing bleaching event. There's no shortage of things to worry about where climate change is concerned, but at least as of August, 2016, it was still very cool to go snorkeling on the outer reef.

Kim T

5 star rating: Highly Recommended June 2017

Excellent experience and great value! We really enjoyed the three separate snorkel areas and the food was good. They gave us plenty of time at each stop and we saw turtles and white tip reef sharks. The Great Barrier Reef was amazing! Lots of fish and coral great biodiversity. I will go back and I recommend this excursion.

Joni M P

5 star rating: Highly Recommended April 2017

We had a wonderful time on this excursion. Arrived at Reef Marina for 0830AM departure. There were 34 snorkelers and about 20 divers, but boat could hold 80. Snorkelers were told to sit on top level of large boat. It had a shaded area and we were given a briefing. Partly cloudy day with heavy rain on our way out to Agincourt Reef. Wore hooded stinger suits provided to protect against jellies...Went to 3 sites for over an hour at each site, after boat-ride of 90 minutes. Sites visited: The Point, Chapel and Barracuda. All were very nice with pink, yellow and blue plate and staghorn coral, giant clams blue, green and orange, trumpet fish, grey sharks, unicorn fish, sweet lips big fish, beaked coral fish and puffers. Beautiful schools of aqua pullers and orange larger fish. Beautiful! Food was great as well!

Doug F

5 star rating: Highly Recommended March 2017

We had a great time. They provide body suits to protect against the sun and stinging jellyfish, which we never encountered, snorkel gear, flippers. The boats are very fast, it takes about an hour to get to the reef. They take you to three sites, give you plenty of time in the water, and provide lunch which was good and which accommodates vegetarians well. Large parts of the reef are very close to the surface-- frequently so close you have to remain horizontal in the water so you don't hit it by accident. In places also the bottom is close enough that holding your breath to dive down and get a good look is quite possible even if you're not experienced at it. They have guides who know the sites and can point out things you might miss-- sea slugs, giant clams, turtles, sharks, unusual species of fish, especially interesting portions of reef. I was concerned at first that things would be distant and that only scuba would let you really see things, but this was not at all the case.

Jason L

5 star rating: Highly Recommended July 2016

This tour was amazing!

Areigna P

5 star rating: Highly Recommended April 2016

Poseidon Great Barrier Reef Cruises are AWESOME! Funny and friendly guides! Great reef sites, and their gear is too-notch!

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