The best diving and snorkeling destination near Sanya - Wuzhizhou Island boasts crystal-clear waters with visibility reaching up to 27 meters. Colorful coral reefs and rich marine life make it a world-class destination for underwater exploration. Reach it by ferry from Haitang Bay in about 20 minutes. Activities range from scuba diving and sea walking to jet skiing and parasailing. The island is premium-priced but the experience justifies the cost. Best underwater visibility from October to April when waters are clearest.