Tourists experience diving at an aquarium in Sanya, south China's Hainan Province, Aug. 3, 2018. (Photos: Xinhua)

Sanya welcomes an increasing number of tourists since the beginning of summer vacation.

Parents and children visit a park in Sanya, south China's Hainan Province, Aug. 4, 2018.

Tourists visit an aquarium in Sanya, south China's Hainan Province, Aug. 3, 2018.

Aerial photo taken on Aug. 4, 2018 shows the scenery of Wuzhizhou island in Sanya, south China's Hainan Province.

Tourists experience water activities at Wuzhizhou island in Sanya, south China's Hainan Province, Aug. 4, 2018.