Hi - there are lots more places to get wet. Ariel's Grotto is one of my favorites and much better than Donald's IMO.
What I do to keep it simple - is just bring a change of clothes for the kids. I let them run and get totally wet in their current clothes and then just change into the dry ones. If you're going at a hot time - laying the wet clothes on the stroller makes them dry for the next round (if there is one).
I find that a lot easier than first changing into the b-suit and then changing AGAIN back into dry clothes. AND, with my kids ages, I already bring a change of clothes anyway due to oops's on the potty leaving clothes dirty. So, I don't bring anything additional.
Since we still bring a stroller, I do, however, make room in the bag for water shoes. I hate having them in bare feet anywhere public (and then, if they have to go potty while wet - you have to take the time to get shoes on them, etc) - SO, when we go in really hot weather and know they'll be getting wet - we do bring the water shoes. But that's just my preference.
ENJOY!