Assuming you will travel on I65, I suggest you check out Mega Caverns in Louisville, Indianapolis Zoo, and the Museum of Science and Indusry in Chicago. For fast food, there are several Culver's locations along the route with great hamburgers, soups, and salads. The Westin hotel in Indianapolis is very nice. I'd be happy to provide advice for dining and hotels in Milwaukee if you need them.
Carol Thank you! Yes, if you have advice for hotels/dining in Milwaukee, would be great!