Tourists experience "undersea walking" at the Wuzhizhou Island in Sanya, south China's Hainan Province, Jan. 11, 2020. More than 83 million tourists from home and abroad visited southern China's tropical island province of Hainan in 2019, up nine percent year on year. Hainan's tourism revenue went up 11 percent over the previous year to 105 billion yuan (about 15 billion U.S. dollars) last year, according to the provincial department of tourism, culture, radio, television and sports. (Xinhua/Yang Guanyu)

Aerial photo taken on Jan. 11, 2020 shows tourists experiencing diving at the Wuzhizhou Island in Sanya, south China's Hainan Province. More than 83 million tourists from home and abroad visited southern China's tropical island province of Hainan in 2019, up nine percent year on year. Hainan's tourism revenue went up 11 percent over the previous year to 105 billion yuan (about 15 billion U.S. dollars) last year, according to the provincial department of tourism, culture, radio, television and sports. (Photo by Zhang Liyun/Xinhua)

Tourists visit the Wuzhizhou Island in Sanya, south China's Hainan Province, Jan. 11, 2020. More than 83 million tourists from home and abroad visited southern China's tropical island province of Hainan in 2019, up nine percent year on year. Hainan's tourism revenue went up 11 percent over the previous year to 105 billion yuan (about 15 billion U.S. dollars) last year, according to the provincial department of tourism, culture, radio, television and sports. (Photo by Zhang Liyun/Xinhua)

Tourists enjoy themselves on the beach of the Wuzhizhou Island in Sanya, south China's Hainan Province, Jan. 11, 2020. More than 83 million tourists from home and abroad visited southern China's tropical island province of Hainan in 2019, up nine percent year on year. Hainan's tourism revenue went up 11 percent over the previous year to 105 billion yuan (about 15 billion U.S. dollars) last year, according to the provincial department of tourism, culture, radio, television and sports. (Photo by Zhang Liyun/Xinhua)

Tourists enjoy themselves on the beach of the Wuzhizhou Island in Sanya, south China's Hainan Province, Jan. 11, 2020. More than 83 million tourists from home and abroad visited southern China's tropical island province of Hainan in 2019, up nine percent year on year. Hainan's tourism revenue went up 11 percent over the previous year to 105 billion yuan (about 15 billion U.S. dollars) last year, according to the provincial department of tourism, culture, radio, television and sports. (Photo by Zhang Liyun/Xinhua)

Aerial photo taken on Jan. 11, 2020 shows tourists enjoying themselves at the Wuzhizhou Island in Sanya, south China's Hainan Province. More than 83 million tourists from home and abroad visited southern China's tropical island province of Hainan in 2019, up nine percent year on year. Hainan's tourism revenue went up 11 percent over the previous year to 105 billion yuan (about 15 billion U.S. dollars) last year, according to the provincial department of tourism, culture, radio, television and sports. (Photo by Zhang Liyun/Xinhua)