There is nothing that will tire a kid out more than a good old inflatable bounce house. We hung out with one of our friends yesterday and took our kids to an awesome inflatable bounce house in Chesapeake, VA and it was a lot of fun! Wyatt and our friend's daughter Rachel loved it. They ran around like crazy, jumping around, climbing on things, and watching their father's sweat trying to keep up with them in those things.
Which by the way, I jumped with them and I was so exhausted. It takes quite a bit of energy to climb through these inflatable things. Good grief.