The four main bays plus the snorkel islands
Ordered from the best beach for swimming to the islands with the clearest water — pick by what you actually want.
1
If you had to pick one beach in Sanya for the cleanest, calmest swim, Yalong Bay is the answer. Its fine white sand curves in a crescent roughly 7 to 8 km long, the water is clear enough to see your feet, the waves are gentle, and the gradient is shallow, which makes it safe for swimming. This is the luxury-resort strip — the Ritz-Carlton, St. Regis and several other brands line the bay — and it feels calmer and more spread out than the city beaches. The trade-off is distance: it's about 25 km from town, so eating outside your resort means a ride in.
2
Dadonghai is Sanya's oldest and busiest beach, and the only one genuinely in the heart of town — walk a few minutes from your hotel and you're on the sand. Seafood restaurants, a night market, massage shops and hotels at every price point ring the bay. The water is warm and the seabed flat, so it's easy to swim, which suits families and beginners who don't want to travel far. The trade-off is the crowds, which are the heaviest of any Sanya beach, especially on weekends and through winter when mainland visitors come south to escape the cold. For a lively beach with everything within walking distance and a friendly budget, this is the most convenient choice.
3
Sanya Bay is a long ribbon of sand running from the city out towards the airport, parallel to the road locals call the "Coconut Dream Corridor" — palm trees leaning into the breeze as far as you can see. The real draw here is the sunset, the best in Sanya: in the evening residents come out to stroll, cycle and play football on the sand. Honestly, the water isn't as clear as Yalong Bay's, and swimming is banned on the eastern section (you can only get in along the middle and western stretches), so it's better for walking, photos and sunsets than a full day in the sea.
4
Haitang Bay is the newest of the bays and has become Sanya's high-end resort district over the past decade. The white-sand beach is very wide and the water deep blue, but what actually pulls people to Haitang is Atlantis Sanya, with its big waterpark and aquarium, and the CDF duty-free mall, one of the largest in the world. It's a strong choice for families who want both a waterpark and shopping. To be straight with you: the beach here has stronger underwater currents than Yalong Bay, so swimming zones are restricted at times, and in some seasons seaweed washes ashore. It's the furthest out — about 30 km (40 to 50 minutes) from town.
5
To see genuinely clear water, you have to head offshore — and Wuzhizhou is the coral island off Haitang Bay where visibility reaches 10 to 15 metres, about as clear as Chinese waters get. The coral is healthy, the sand white, and it's the best spot near Sanya for both snorkelling and scuba. There's a full range of watersports — jet-ski, parasailing, a sea-walk on the seabed — plus the famous "eternal love" photo viewpoints. Take a car or bus to the pier, then a roughly 15-minute speedboat across; go early to beat the crowds.
If Wuzhizhou sounds too busy for you, look at West Island (西岛) to the west of town instead. The activities are similar — snorkelling, diving and watersports — but there are fewer visitors and the mood is more relaxed. It's an old fishing island with a real community still living there, so it has more local character than a full-on resort island. You take a boat across, just as you do for Wuzhizhou. It's a good fit if you want clear water without the crush.