re: Paris for Thanksgiving - side trips?

I love Colmar, but 7 days isn't as long as you think.

The standard easy "day trips" from Paris are Versailles and Reims/Champagne. Versailles only really takes a half day so you don't have to include that as a day trip and could just consider it part of Paris, and Champagne seems like a waste of time with kids (although the cathedral is very nice).

Suggestions already in this thread are good.