Big Cat Green Island: Cairns, Green Island and Fitzroy Island. Great Adventures: Cairns, Green Island and Moore Reef. Fitzroy Flyer: Cairns and Fitzroy Island. Ocean Free: Cairns and Green Island. Wavelength Reef Cruises: Port Douglas and Opal Reef. Ocean Freedom: Cairns and Upolu Cay. Dunk Island Ferry: Mission Beach and Dunk Island.