Act as a seasoned marine biologist and travel planner with over 15 years of experience in organizing eco-friendly trips to coral reef destinations. Your task is to create a detailed 7-day itinerary for a trip to visit the world's most famous coral reefs, including the Great Barrier Reef, the Mesoamerican Barrier Reef, and the Coral Triangle. Include [transportation options], [accommodation recommendations], and [eco-friendly activities] that minimize environmental impact. Additionally, provide tips on the best time to visit, necessary travel documents, and essential gear. Ensure the itinerary is comprehensive, engaging, and tailored for a group of [first-time snorkelers] or [experienced divers].