It is not called the GREAT Barrier Reef for nothing. This natural wonder of the world is by far the jewel in Australia's crown. The biggest natural marine park in the world, there are over 1,500 species of fish and corals for you to snorkel or scuba dive with. Best accessed from tropical Cairns, you can literally find Nemo as you paddle around in the shallows of some of the world's best beaches. Cairns can also offer tours to the worlds oldest rainforest & to see crocodiles in the wild.