Obi-Wan was there! He'd show up in a basic swimsuit and shirt, and while he'd be fascinated by the TARDIS (I'd imagine she feels very much a living thing in the Force but that's a discussion for another time) he'll keep his hands to himself and make his way to the water park. I'm assuming the other Jedi went too but don't want to speak for them.
I think he'll have a good time: he's never been to a water park before and it'll be a good escape from moping around thinking about what happened to Anakin.