I was on a guestlist courtesy of my fellow Yelpers who steered me to http://www.freevegasclubpasses.com/. Voodoo lounge was what they suggested for the first night in Vegas, so I taxied my way over from the strip (like $10 from the Palazzo).
You check in Masquerade Village/Tower second floor and then take an elevator to the 51st floor. There is a small indoor lounge as well as a rooftop lounge. If you can brave the gusty outside (you are on the roof after all!), the view of the strip is simply spectacular. I also got a free drink with my guestlist entry (little did I know, it started at 11 and I got there at 10.30, but the bartender was awesome and talked to his manager for me!)
I lucked out because the night I went they had live music (a cover band), but they had a DJ outside. I didn't dance, but it was fun to people watch. I'd probably come back again, this time to try a Witch Doctor!