Free show at the Rio, every hour on the hour. The show happens above the casino by Chippendales' box office. The view is better if you're on the 2nd floor, and you're not looking up and twist your neck.
If you're lucky, you might catch some beads without having to show your tatas!!
Fun, energetic, and it's free. If you're at the Rio, make sure to check it out. I wouldn't make a special trip for it though, it's short.