Explore the heart of the World Heritage Great Barrier Reef Marine Park on this day trip from Cairns. Journey on a semi-submarine catamaran that's perfect for all ages, swimmers and non-swimmers alike, with a range of onboard and water activities. Travel to a spacious activity platform moored at a site on the outer edge of the Great Barrier Reef. Spend 3 hours enjoying the activities and facilities of the platform and discover the marine biodiversity of the reef is at its most extreme. Snorkel amongst vibrant coral gardens that are home to extraordinary marine life and rainbow-colored tropical fish. Enjoy easy access to the water from the snorkel platforms. You might even meet Wally, the most friendly fish in the reef. If you choose to stay dry, discover the reef from the underwater observatory. Enjoy the comfort of the air-conditioned semi-submarine with expert commentary.