There is an interactive water play area at SWF. It's behind Shamu stadium. There's a ship wreck in the middle of some water. It's not deep, maybe a foot at the most. There are squirt guns on the ship, and people get wet, but I wouldn't call it swimming. Then off to the side is another water jungle gym thing with some tunnels. It's small and will only keep the kids busy for about 5 minutes.
One time we went, I brought a change of cloths for the daughter, and let her get wet. I stayed dry and watched.