Pretty much just pick anyone of the main ones on the southern part of the strip Bellagio, Venetian, MGM, etc. at it's a guarenteed good time. If you go to this link
http://www.vegas.com/nightclubs/index.html it has a list of clubs. Once again any one of them on the main part of the strip on a Friday or Sat will be packed. That link will tell you what kind of music each one plays, dress code, average drink costs, etc. I've been there 3 times in the last 3 years and every time is just as fun. It's nearly impossible to not have a ridiculously good time. Sorry though can't help with the Gentlemens clubs and golf. I'm usually too drunk for both of those activities