Tourists amuse themselves on a beach in Sanya, a popular resort city in south China's Hainan Province, Oct. 6, 2013. During the seven-day national holidays since Oct. 1, many people came to the seaside to enjoy their leisure time. (Xinhua/Zhang Yongfeng)

Tourists pose for a photo on a beach in Sanya, a popular resort city in south China's Hainan Province, Oct. 6, 2013. During the seven-day national holidays since Oct. 1, many people came to the seaside to enjoy their leisure time. (Xinhua/Zhang Yongfeng)

A boy swims in sea water in Sanya, a popular resort city in south China's Hainan Province, Oct. 6, 2013. During the seven-day national holidays since Oct. 1, many people came to the seaside to enjoy their leisure time. (Xinhua/Zhang Yongfeng)