As Alin said so much to do but you better have cash that brings the power. Jet nightclub is awesome IMO. There is a new one opening LABOR DAY at the LUXOR called LAX and from what I hear is going to be off the chain. Goo luck if u need any more hel p lmk I can do my best as I am sure others on here can just as well.
RUMJUNGLE- MANDALAY BAY
JET - MIRAGE
STUDIO 54- MGM
PLAYBOY CLUB, GHOST BAR, RAIN, MOON- PALMS
VOODOO LOUNGE- RIO 51ST FLOOR AWESOME VIEW
TAO- VENETIAN
LIGHT- MIRAGE
CHERRY- REDROCK
RISQUE- PARIS
Drais is a awesome after hours I have to be honest I forgot where that one was go figure yeah. I will find out that one for you.
There r other clubs I did not mention but these r the ones that play mostly trance, house, techno, hip hop.
Clubs like PURE or Tangerine even TABU relax type Jazz which is all fine but u need to be in the right mood for that stuff. I myself am a raver so I just hit the ones I listed above. God luck I hope this helps.