Not for the faint of heart.
Dress nicely with a swimsuit under your pants/skirt/dress, walk into a posh hotel, head straight for the pool.
Grab a towel - they're usually in a basket or pile nearby, strip down and dive in.
As long as you don't bring one of those "Six-pack Floaters" with you, nobody should ask what you're doing.
I just hung out with my friend's AG and CS in the roof-top pool of the Renaissance Hotel in Hollywood, and I bet there's a hotel pool waiting somewhere near you. GET IN THERE!
What's the worst thing that could happen? The pool-boy asks you to leave? Some people spend their entire lives never even talking to a pool-boy, so it sounds win-win to me.