Soi Mango has many girly bars and late night dance clubs. Located just off Chaweng Beach Road where you can get street vendor food, shopping items, drinks and many great restaurants to choose from.
Wikipedia:Ko Samui island of Surat Thani Province (or Koh Samui, Thai: เกาะสมุย, Thai pronunciation: [kɔ̀ʔ samǔj]), or often, simply Samui as it is referred to by locals, is an island off the east coast of the Kra Isthmus in Thailand, close to the mainland Surat Thani town. It is Thailand's third largest island, with an area of 228.7 km2 and a population of over 50,000 (2008). It is rich with natural resources, white sandy beaches, coral reefs and coconut trees.