The Great Barrier Reef, a UNESCO World Heritage site off the coast of Queensland, Australia, is the world's largest coral reef system, composed of over 3,000 individual reefs, 600 islands and 1,625 types of fish. Accessibility varies depending on the specific location and tour operator, with some offering wheelchair-accessible boats and snorkeling equipment. Both solo and guided visits are possible, with guided tours recommended for first-timers to maximize safety and information. Stinger suits are advisable during stinger season (October to May). Costs vary widely depending on the tour and activities chosen, from budget-friendly snorkeling trips to luxurious liveaboard diving excursions, ranging from approximately $100 to several thousand dollars. Typical visit duration ranges from a single day trip to week-long liveaboard experiences. Booking in advance, especially during peak season (June-October), is recommended to secure preferred tours and accommodations.