Most people come to Cairns to visit the Great Barrier Reef. There are many rainforests, white beaches, corals and abundant and diverse marine life. You can do several activities here at Green Island where the clear water invites you to dive, swim, and snorkel to your heart's content. Also very famous here is the semi-submarine ride and the glass bottom boat ride and it is one of the best tourist places in Cairns Australia.Both of these are excellent options if you are a marine life enthusiast. Visit Green Island has live commentary, the hosts of which expound the wonders of the corals and live fish feeding. There are 3 tours departing at 9 am, 11 am and 1 pm every day. The green island national park is also worth checking out. This is a once in a lifetime tropical island experience not to be missed. Location: It is situated 27 km offshore from Cairns, Queensland in Australia. Highlights: Green Island is the gateway to the Great Barrier Reef, which is the largest living thing on the planet and is even visible from space.