Moreton Island, off the coast of Queensland, Australia, is the third largest sand island in the world. Famous for its sand dunes, freshwater lakes and shipwrecks, the island is a paradise for outdoor activities. Snorkel or dive around the shipwrecks, explore the island in a 4x4 or sandboard on the dunes. The island is also home to a wealth of wildlife, including dolphins, whales and seabirds.