Hainan Chengmai Coconut Sea Hot Spring Home. According to Baidu map, there are Tai Chi learners in Hainan ancient town, and Yang Tai Ji Chuan public welfare training in Chengmai Coconut Sea Hot Spring Garden. The old city of Chengmai County, Hainan Province is located in the northwest of Hainan Island, adjacent to Haikou, the provincial capital. It has beautiful scenery, pleasant climate and convenient transportation.