Can I go to Nanshan Temple at night?

You can't. According to Baidu map, the opening hours of Nanshan Temple in Sanya are 8:00- 17:30 every day, and you can't go in at night. Nanshan Temple in Sanya has two night prayers every year, one on New Year's Day and the other on New Year's Eve. Nanshan Temple in Sanya City, Hainan Province is located in Nansan "Buddhist Cultural Park", 40 kilometers west of Sanya City, Hainan Province.