11Jul Thailand to close Koh Tachai island over tourism damage Categories: Recommended Reading Tags: Environment, Kho Tachai, marine national park, Natural Resources, negative impacts, Similan National Park, Thailand Comments Off on Thailand to close Koh Tachai island over tourism damage Image Source: BBC Thai authorities are set to close the island of Koh Tachai, saying heavy tourism is negatively affecting natural resources and the environment. The island, off Phang Nga province, is part of the Similan National Park. Almost all Thai marine national parks close to tourists from mid-May to mid-October for monsoon season but Tachai will not reopen, the Bangkok Post says. By BBC. Read more.