Get ready to mark "Dive the Great Barrier Reef" off your diving list. This must-see World Wonder offers expansive coral reefs, giant potato cod, and large pelagic experiences in the pristine Coral Sea. The Great Barrier Reef is also conveniently close to the lovely city of Cairns, which serves as the base not only for diving adventures but also for wildlife experiences, rainforest getaways, and outback adventures. To get the true Great Barrier Reef Diving Experience, though, you must dedicate a few days to the exploration. The following liveaboards offer this unique and true adventure where you won't see the madness of hundreds of other dive boats and your experiences can be as endless as the reef itself seems to be.