From the World Heritage inscription:
Fraser Island lies just off the east coast of Australia. At 122 km long, it is the largest sand island in the world. Majestic remnants of tall rainforest growing on sand and half the world’s perched freshwater dune lakes are found inland from the beach. The combination of shifting sand-dunes, tropical rainforests and lakes makes it an exceptional site.
Fraser Island is a very popular stop on the route from Sydney or Brisbane to Cairns. As the largest sand island in the world, all the vehicles which operate on the island have to be 4-wheel drive. This includes tour buses. The island is a popular location for overnight camping an independent exploration. I ended up taking an organized tour which, in hindsight, I sort of regret doing. It would have been more fun to just rent a jeep and drive on the beach.
The most notable fauna on the island are the dingos. The Fraser Island dingos are considered the most “authentic” in all Australia as they have been protected from interbreeding. While they normally cause no problems, they are dangerous and only a few years ago a pack of dingos killed a 9 year old boy on the island.