Pool Party if you are not at the hotel

I am going to Vegas with some younger friends and staying at the El Cortez. I know they would like to go to a pool party in July. Can you rent a cabana at a hotel on the strip if you are not staying there? Is there a place you might recommend for 26 year olds? I will be playing BJ or rolling dice during it.

Yes, you can rent a cabana at pretty much any hotel in Vegas, without regard to whether you're also staying there. If you can pay, you can play.

As for which cabana would suit your group best, I suggest you browse Vegaschatter, they follow the pool party scene pretty closely.