I'm not familiar, are the hotel pools free/public? Or are you just implying you walk in like you belong, and they don't check if you're a guest at the hotel?
Most of them make you flash your room key, but they don't really check to see if you're a current guest.
Edit: A few of the pools allow swim-up gaming. I believe they are legally required to allow you into their pool if you say you want to play blackjack there, since they can't offer private gaming
Edit 2: Some of the casinos have "Pool Parties" or "Day Clubs" or whatever, usually loud, booze-soaked affairs with big-name DJ's, which you do not have to be a hotel guest for, but you do need to buy tickets.
Edit: A few of the pools allow swim-up gaming. I believe they are legally required to allow you into their pool if you say you want to play blackjack there, since they can't offer private gaming
Edit 2: Some of the casinos have "Pool Parties" or "Day Clubs" or whatever, usually loud, booze-soaked affairs with big-name DJ's, which you do not have to be a hotel guest for, but you do need to buy tickets.