Visit the French National Car Museum and the associated Train Museum when you visit Mulhouse.
It is one of the best in Europe.
http://www.citedelautomobile.com/en/home
http://www.citedutrain.com/en/home

You could visit Ettlingen when you drive north from Baden-Baden.
The road from Baden-Baden to Gernsbach to Bad Herenalb, to Marxell to Ettlingen is much nicer than the A5.
There is a car/motorcycle museum in Marxell that is entertaining to visit.
http://www.fahrzeugmuseum-marxzell.de/

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