It’s difficult to know where to start with a trip to the Great Barrier Reef, and that’s part of what makes it trip-of-a-lifetime stuff. Factor in plenty of time and as well as seeing some of the world’s most dazzling marine life you can trek through ancient rainforest, island-hop around the Whitsundays with their white silica sands (also one of the world’s most scenic spots to skydive), chill out on tropical idylls such as Hayman and Lizard, and enjoy a seaside retreat in vibrant destinations such as Cairns, Airlie Beach, Hervey Bay, Mission Beach and Port Douglas.