Chicago to Gatlinburg Ride -- advice/suggestions requested

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Update: Looks like our group will stop for the night in Lebanon, OH. It's about halfway from Chicago to Gatlinburg. I have mapped out a route that keeps us off the interstate and on state and US highways for most of the way, but I'd love suggestions of any good roads to hit, especially south and east of Indy.

I'm still working on our route from Lebanon to Gatlinburg which includes a stop at Cumberland Falls State Park. I might be persuaded to hop on I-75 south of Cincy for part of that leg, if people think that's a pleasant route (for an interstate). Any suggestions on routes, or even individual sections of road, would be appreciated.

Been visiting websites telling me about Tail of the Dragon and other roads in the area, but I haven't planned anything for our day rides once in Gatlinburg. Keep those ideas coming, too.

Thanks so much for everyone's help. Very excited about this trip.