If your still a kid at heart go to Worlds Of Fun. I haven't been in a while. Took my son about 8 years ago and we both had a blast.
I know this isn't in KC but Branson is a good stop in southern Missouri only 2.5 hours from here. I'm going down there for another weekend trip this year.
Dang, I need to win the lottery so that I can afford to higher you two to show me around down there.