Everyone has to check out Moon at least once in Vegas. Forget Pure, Tao and the other clubs.
Moon is pretty big but slightly smaller compare to other clubs but Moon has one thing no other club has which is their retractable roof. They usually open the roof when the weather is hot especially during the summer. I went last winter and sadly they didn't open it but the venue is pretty nice especially with the balcony over looking Vegas.
In order to get into Moon, you have to go through the Playboy club. Just a brief elevator or escalator ride and you are on the top floor of the Fantasy Tower. Drinks are somewhat expensive but that's Vegas for you. Don't be intimated by the big bouncers when you step out of the escalator. I was holding a drink that i brought at the Playboy Club, the bouncer just took it without saying anything! I was shock and slightly buzzed but the bouncer just wanted to switch my drink into a plastic cup and gave it back to me.
I miss Vegas! :D