Boundary Island, also known as Fenjiezhou Island, is a significant natural attraction in Hainan, celebrated for its unique geographical position as a climate dividing line and its exceptional natural beauty. Visitors consistently highlight the island's 'glass sea' or 'jelly sea' with its clear, gradient blue and green waters, fine sand, and diverse scenery that includes mountains, cliffs, reefs, and tropical rainforests. It's often described as a complex landscape offering both entertainment and relaxation, making it a distinctive romantic coastal destination.
Reviewers frequently praise the wide array of marine activities available, such as diving (including reef, cliff, and shipwreck diving), parasailing, jet skiing, and banana boating. Many consider it one of Hainan's best diving spots due to its clear waters and rich marine life. Beyond water sports, the island offers attractions like an ocean theater with sea lion shows, submarine tours, and opportunities to feed stingrays, though some find the latter crowded. The island's picturesque settings, including 'Moonlight Castle' and 'Cliff House,' are popular for photography, especially among couples.
To make the most of your visit, several reviewers recommend taking the battery car to explore the island, especially to reach higher points like the Joy Pavilion for panoramic views, as walking can be hot and tiring. It's advisable to purchase tickets online in advance, often as a package including ferry and sightseeing bus, which can save money. While there are restaurants and snack stands, some visitors note that entertainment projects can be pricey, so budgeting for these is wise. For diving, it's suggested to visit when the weather is warmer (above 25°C) for better visibility and comfort, as colder temperatures can make the experience less enjoyable.
Common complaints revolve around the high cost of individual entertainment projects and the potential for crowds, especially at popular spots like the stingray feeding area. Some visitors who have experienced Southeast Asian islands find Fenjiezhou Island 'just average' in comparison, though still one of the best in China. To mitigate these issues, consider visiting during off-peak seasons or weekdays to avoid the largest crowds. If budget is a concern, prioritize the natural scenery and ferry ride, and be selective about which paid activities to engage in. Accommodation is available on the island, with options ranging from sea-view rooms to cabins, offering a tranquil overnight experience for those wishing to extend their stay.