Baden-Baden is a nice day stop. I did the same drive last November and we instead visited the champagne region. We didn't stay anywhere spectacular but found Reims to be a nice city and enjoyed the vineyards and country roads outside of town.
Colmar is a wonderful town with lovely canals and would make a good stop. There is great food and sights in riquewihr and rebauville (2 towns near Colmar, I may have butchered their names). If with foodies, French country cooking must be experienced. The expensive Auberge de I'lll is one of the greatest meals, 3-star Michellin. http://www.viamichelin.co.uk/web/Res...poi=3838_41102
In Paris, take your family for afternoon lunch at Le Comptoir in Odeon near D'Orsay. Wow that was amazing, we spent Beaujolais Nouveau there. http://www.foodandwine.com/restauran...e-france-paris
Have a great trip.
If you're into history, the trenches in Verdun could be a good lesson or the kids (it is the 100th anniversary of the beginning of the First World War). If i recall correctly, St. Mihiel is about 20 minutes from the highway and it was an American offensive largelyforgotten by all but most avid history fans.
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