This is the spot for pickup basketball in Vegas. There are four nice indoor courts and there's usually pretty good run during the night time.
The gym is also one of the most modern and cleanest I have been to, with a ton of cardio and lifting equipment, a pool, and classes for those looking into yoga, etc.
The membership fee is $25 per month with a one time $20 ID card fee. For just a day, it'd be $10.