Some people might not know where to go for night life activities so here is a non-exhaustive list.

• Revolver - social bar
• Maji square (at yuanshan) cheap night, Triangle club, Tiki Hut, etc
• Xinyi qu - expensive night with local Taiwanese clubs. This is good for going with friends, but the locals typically won't chat with you.
• La Fin - new night club in xinyi qu
• AI - club in xinyi qu, has some Taiwanese gangsters
• 1001 Nights - $600 get three drinks, Latin music, mostly foreigners, closes at 6am.
• Pawnshop - City outskirts, some drug use
• Studio 9 - $500 cover, one drink, techno music
• Pipe Live Music - Gong guan area, has outdoor bars and techno music night club
• Game over - this is a video game bar

If you got questions just let me know. Most foreigners just go to maji square on Fridays / Saturdays cause it's cheap and is foreigner friendly.