Catcha Falling Star is walking distance. They once had a day pass but since they added so many rooms, that's only available now when they are at
low occupancy. Rick's also has ocean access but you're at Rick's. We went once with a friend who was eager to get in the water to try his new underwater camera. Go on Sunday just as they open the gates because the place starts to fill up with Benzes and beemers around noon and you will feel the need to flee. Xtabi is a short cab ride and has easy ocean access through a pirate cave where you can hang out in the shade and swim. No cost but we always eat at the bar when we're there. Hope this helps.