I do not envy the Cleavland to Indianapolis leg. Brutally boring country northern Ohio and Indiana... The whole great plains can be rough, but man oh man there is a special, dark place in my heart for terrain that flat. I'm from northern Indiana, and unfortunately there's not a ton to do without going to Chicago (Navy Pier, Museum of Science and Industry) or down to southern Indiana (Wyandotte Cave is pretty nifty...French Lick is kind of a cool little town to stop and check out). But yeah...if you're going Cleaveland to Indy to Clinton....not a lot in between there.
Don't get me wrong, Indy is a fantastic city...but it needs some more tourist attractions.