I've not been there, but about 90 minutes south of KC is an offroad park. You might check out their site and see if that interests you - it is
Home - KS Rocks ParkKS Rocks Park.
Are you into Civil War history? I know there are a couple sites around. Fort Scott has an old frontier fort. Lexington MO has a battleground. There are others, just can't think of them off the top of my head.
If you like shipwreck museums, look into the Arabia Steamboat Museum - that's in KC. It's a steamboat that went down in the MO river in the mid 1800's. They dug it up in 1988 and have artifacts on display. That website is
A Historic Kansas City Attraction | The Arabia Steamboat Museum.