Australia’s famous Great Barrier Reef needs no introduction and occupies pride of place at the top of most visitors’ must-see list. The amazing reef (the largest in the world) is made up of over 3,000 separate reef systems and dozens of beautiful, inviting tropical islands surrounded by azure waters teeming with marine life. You can access this wonderland from several coastal cities, including Cairns, Townsville, Rockhampton, and Mackay. Activities at the Great Barrier Reef are generally centered on the amazing marine life, which draws snorkelers and scuba divers – if you prefer to keep your feet dry, you can join a tour on a glass-bottomed boat instead. Boating, sailing, scenic helicopter flips, and simply relaxing on the beach complete the picture.