I would recommend a trip to Dunkerque, where the beach landings were during the war. It's a lovely little town.

Any town you go to, you have to be up early one day and make it to a bread shop for the fresh out of the oven chocolate bread (choc du pain) or whatever they call it. There are prehistoric caves, Notre Dame, the Louvre and numerous other art galleries.

Depends where you go of course, but tons to do.