Depending on the length of your stay at Big Bone you may be able to spend some time at the park itself. The campground isn't real big but it does have a pool, playground, miniature golf, and a fishing pond. Down toward the front of the park is where they keep the buffalo and there is a small museum (like ten minutes tops) to go through. We stayed there last summer and had a decent time. Kentucky Horse Park is where it's at though. Tons of stuff to do there. If you are hell bent on going to Cincy then go to the Newport Aquarium, walk across the Purple People Bridge, and catch a Reds game. If you want to head on up 75 to where I'm at in Dayton, then the Air Force Museum, Carillon Park, and Youngs Jersey Dairy would all be fun places to go.