You can have fun in Ohio if you know where to look.
Between Dayton and Cincinnati, on I-75, there's all kinds of fun stuff. There are two mammoth flea markets, one on either side of 75. One got busted last year for fake purses and reopened under new ownership with a pirate theme. There's a Hustler Hollywood store (in Ohio?) on the same exit. Right before that exit is
Big Butter Jesus. If you're brave enough to dodge traffic, it's fashionable to get a photo of yourself giving Jesus a high-five.
Go on south on 75 and there's a nifty aquarium, complete with pimp-lounge themed jellyfish display, a ginormous zoo, and the
most fantastic place on the planet. Right across the border in Kentucky is the notorious Creation Museum.
Head north of Dayton on 75 for about 40 minutes and there's some lesser-known neat stuff. In Lima there's a plastics factory that has a huge thrift store on premises. It's toned down a little bit, but in the day you could buy just about anything they ever made. About 3 years ago I walked off with a bunch of trash cans, various small things and a brand new Double Dare lunch box with thermos for less than $10.
About 10 mins north of that is the Neil Armstrong Air and Space Museum, which is remarkable for being "space age" and completely dated at the same time. The in-house movie excitedly describes plans for the new space station called "Skylab".
And that's just on the I-75 north-south route, about 2 hours from one end to the other.