score:5
I really like Strasbourg as a place to visit. It's about an hour's drive, or you can take the train if you want an easy trip.
In Strasbourg itself, you've got quite a few museums to visit, but you may need to leave one person outside with the small child... It's worth climbing up the church tower for the view, and there's lots of nice places to see around the old town on foot
Otherwise, in the area you're in there are lots of old castles on hill tops, generally with a really nice walk up through the vineyards and then woods to get to them.