Dadong Sea has Sanya's best balance between development and natural beauty. The town behind Dadong Bay is more expensive than Sanya, but has better restaurants and a gorgeous beach. The ocean has algae blooms that vary the water from thick green to tropically clear. However, even when "tropically clear" the ocean bed is just sand with a rare school of fish or eel. See the beach both in the morning, at sunset (sets gorgeously over the hills), and at night (when people are very scarce). Check out the trails that lead between tide pools along the Westernmost rocks of the beach. The tip of the trail has a dramatic view of the ocean and a deep and deadly ocean cave.