We've rented bounce houses a few times for my sons 3,4 and 5th birthday parties. It was a blast. If you don't get a lot of shade in your yard it gets hot. Last year we went to an indoor bounce house party place, jump zone in canton. Kids had a blast there too. And it's 2 hours and done. No clean up, no people at your house.... In and out.
My buddy went to that great wolf lodge too. His daughters loved it. Think they're 4 and 5.