Fraser Island and the Whitsundays are often the most talked about portion of a travellers trip in Australia.
Fraser Island is the worlds biggest sand island. Most of the trips here consist of crazy travellers driving around the island and it's beaches in large 4x4's. You can have a guided tour if you like but the cheaper and more adventurous route is the self-driven tours.The island is surrounded by gorgeous beaches and there are many trails on the island as well. The Fraser Island Great Walk is a nice way to see the island on foot. It is 90km though so be prepared!Other exciting things to do would be swimming down Eli Creek, the largest creek on the island. There is a boardwalk that provides easy access to the top. There is the wreck of the S.S. Maheno to check out, laying out in the open on one of the beaches.
There are 74 islands in total. The largest and most famous being Whitsunday island. One of the best attractions here is Whitehaven beach. Whitehaven beach on is georgeous. The beaches are almost all crushed coral which gives them their pure white color. Try and plan your sail on days with good weather as parts may be uneventful or cancelled if the sun doesn't shine.You can get to the Whitsundays fro the ports of Airlie Beach and Shute Harbour. Tourism offices offer everything from sail tours of the islands to jet boat, helicopter or float plane tours. Careful of the long boat tours, they can get a bit itchy(as can any budget accomodation in Australia).When you've made it out to the islands, you can hang out on the boat and just take in the view, cruise around on ocean kayaks or rafts or hop right into the water with your scuba or snorkel gear. The diving can be exceptional in any spot you choose with some good ones being Hayman and Hook Island or Manta Ray Bay.