Any ideas on a road trip for 3 to 4 days? We are looking at KY, IL, OH, or MI since we live in IN.?

We live in East-Central IN. Hubby and I are 31 w/ no children, so we will steer clear of children oriented activities. We are putting our annual trip to TN off until later this year, but would like to get away within the next 2 to 3 months. We both love the outdoors, but I do not like to "rough it" when it comes to accomodations. I was thinking of just a road trip to view some countryside. Any suggestions?