Sharp Island in Hong Kong. Greenpeace Hong Kong made the call after its field survey found that 4,062 people visited the Hong Kong Geopark on Sharp Island in Sai Kung on Wednesday. October 1 is a public holiday in Hong Kong and the beginning of an eight-day nationwide holiday in mainland China. This may exacerbate the persistent problem of coral bleaching in the area in recent years.”Coral reef at Hong Kong’s Sharp Island. The “overcrowding” at Sharp Island this week proved that the approach of strengthening enforcement at specific tourist hotspots was a “piecemeal solution” that does not solve the issue of overtourism, he said.