The world’s largest living organism, the Great Barrier Reef, never fails to dazzle. Set out on a catamaran to explore a kaleidoscope of colour: over 1,500 species of fish, 215 different birds, 3,000 molluscs, six of the world’s seven marine turtle species, and 30 species of dolphins and whales are residents. Strap on a snorkel or visit an underwater observatory and semi-submersible craft to take in the menagerie without getting your hair wet. A tropical buffet lunch is served onboard before you return to Cairns.