Tips for places to visit Reims-Stuttgart

[LukeBird]

My cousin and I are booked to cross to Dunkirk in October, have Monday-Friday and have plans to visit Reims, Porsche & Mercedes museums (and hopefully a factory tour at the former!) and some derestricted Autobahn too...
Any other suggestions of places to go; Nurburgring is a possibility, but I can't say I'm desperate to do so, a little fearful of Tourist days!
Is there anywhere else we should be going to look at? Thanks in advance for any pointers.

[LukeBird]

Thanks for the replies, much appreciated. Planning the route and the stops now.