Depart Cairns on a fast catamaran, which provides a smooth 1.5-hour to the outer Great Barrier Reef. When you arrive at the pontoon, begin your exploration of the reef, a complex and diverse ecosystem home to more than 1,500 species of fish, 400 types of coral, 200 types of birds, and 20 types of reptiles. Snorkel in the sheltered coral lagoon, go scuba diving with a certified dive or introductory session (no experience necessary), or join the on-board marine biologist for a guided snorkeling safari (diving and guided snorkeling at your own expense). Our marine biologists conduct a presentation in the only science lab on the reef. You can also enjoy a session with our marine biologist, who points out resident fish like "Wally," the Maori wrasse. You can even stay dry and view the marine life from the semi-submersible reef viewer, glass-bottom boat, or underwater observatory. Other optional activities (own expense) include a helmet dive for a scuba-style experience up to 3 m deep, or a scenic helicopter flight for an aerial adventure over the reef. Or, simply relax and enjoy the tropical weather on the sundeck.