The Great Barrier Reef is a must-see. The Great Adventure itinerary includes two classics, Green Island and Norman Reef, which are very reasonable. It is recommended to book a helicopter in advance, because only the Great Barrier Reef seen on the helicopter has a full view. In addition: all cruises can be booked at Cairns Pier, just in the lobby of Reef fleet terminal. It is also possible to redeem your ferry tickets one day in advance.