Vegas 11/18-11/21

I'm going to Vegas for my 21st with 2 of my bros. We're staying at the Monte Carlo.

Any hotspots(clubs, lounges, bars) with people our age or generally younger? Venue suggestions? We want to take in as much of the strip as possible but I'm looking at the Rio, Palms, Hardrock, and Fremont st. just for a change of pace. Hopefully my concierge can get us on the list at most clubs, if not, do any of you have suggestions? Any other tips?