Do you even make your sims swim? All they can do is swim laps and splash people. There's the jumping platform but that's just a way to get into the pool. I like building pools but they're so borin...
I put a pool in the basement rec room of one home (the dogs loved it, as I mentioned before), but something that was kind-of cool is there was a thing that looks like a drain that actually produces bubbles (and it even looks slightly steamy when inside, which was cool to look at). Looks like it came with 'Get Together'. I may have enjoyed it more than the sims... though the little dogs enjoyed it better than any of us. ;)