Sneak into the grotto in vegas

I'm staying in the Tropicana on the Las Vegas Strip. The pool here has waterfalls, swim up blackjack, and adult lagoon, and hot tub jacuzzies nestled in various nooks. The thing is, nobody asks for your room or anything, so I think anyone could just sneek in. Hang out in the forest of planted palm trees and then jump in the jacuzzi.