For tourism places you have 2 places with "啤酒文化休闲广场", "三沙市政府广场" for example.
The area offers 2 spots in the "restaurants" category.
As "三沙市邮政营业厅", 1 post offices exist in the area. You can find 1 fire stations locally like "三沙市消防支队" In term of town halls you can find 2 location in the region (like "三沙市人民政府", "三沙市人民政府大楼"). For banks and/or ATMs you have 1 places with "中国工商银行三沙市分行" for example.
About supermarkets, 1 possibilities exist (like "三沙超市").
The following are the major cities: Sansha, 三沙市, 永兴(镇)管理委员会.
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