Memphis Kiddie Park is super cool. My kid agrees.
We went on the Little Dipper FIVE times. I got dizzy. He got whiplash.
Tickets never expire, so if you need to leave before you use them all -- just come back!
Drawbacks -- it's a bit expensive as it costs $2.00 per ride and most of them are really short. Also, I wish they had some sort of wristband you could buy so that you don't have to carry tickets and keep buying them.
If you're hungry, they got corn dogs 'n shizz. (They don't let you bring in your own food but I do anyway. Just be smart ,aka sneaky, about it.)