Under 21 in Las Vegas
 

We are a group of male college students who want to see Las Vegas but are not 21. Can we go to the shows? Can we walk through the casinos? What else would be fun?

You can go to the shows and you can walk through the casinos. By "through" I mean don't linger by any slot machines for longer than a second or you may be questioned and asked to leave.

Oddly, LV is great for little kids and for adults. But there is not much to do for 18-20 year olds. The casinos are very strict about ejecting anyone under age. They have to protect their multi-billion dollar gaming licenses. You can go to SOME shows but not all. Other than that desert sightseeing, shopping and laying out by the pool is about it.

"Some" shows? I know a few shows prohibit children and especially babies, but the 18-20 crowd should have no problem at all getting in to ANY show.

going to vegas when you are just under 21 would be like dangling a persons favorite food in front of someone and telling them they can't touch.

I'd suggest staying at either the Hard Rock Hotel or the Rio if you're too young to gamble and want a fun pool atmosphere for the younger crowd without attracting kids.