I had an amazing time at Marquee on my last two trips to Vegas. This Cosmopolitan club has been the go to club for the last couple of season and I have a feeling they are going to have a pretty long reign at the top. They bring in amazing DJs that perform on their main dance floor, I was lucky enough to catch Kaskade on my last trip. Warning thought, if a major DJ is playing the main floor will get PACKED! If you want to fight it out for a good spot on the floor head over a couple hours before they go on stage.
Once you are inside there are three different themed floors, the main floor (house/EDM), the Boom Box room (hip hop and pop), and the library (a much mellower vibe). The main floor also connects to an outside area that has another DJ. The decor is dark but very artsy hip in the color theme of mostly black and purple. I'm not sure if artsy hip that is the right way to describe it, but those were the words that I thought of when I went. Of course there are bars everywhere to help you dance the night away and fight away the cold if you are outside in the winter. The drink prices are pretty standard for Vegas...expensive, but that is Vegas for you.
I highly recommend getting in touch with a promoter. If you are an all girl group and it is a holiday weekend you should be fine getting in for free. If you have a good ratio (I would say at least 4 girls to 1 guy if not more girls) than the girls again should be fine, but guys be prepared to pay at least $50. If you are a big all guy group look into shelling out the big bucks for a table. When meeting promoters to let you in, be sure to find the Queue Bar that is a couple floors below the main entrance of the club because that is where they meet you to take you up to the club.
The only reason why this place loses a star is because of the STAIRS. No elevators! You might get to use one if you get the right promoter on the way in, but after that you will feel your heels ever step up and/or down for the rest of the night.