You can go down to Xtabi and buy a drink and hangout and jump in the ocean there.
Another good place that doesn't get a lot mention on here is Pee Wees down by Ella Drive.

Between the two I would pick Pee Wees. It's across from No Limit Bar.
Cheaper drinks, beers and food plus the water is always calm.
Just jump in a route taxi for $100J's each and you are there.