Drive to Paris 2 nights. Louvre would be nice but I've heard so many bad things about lines and tourists. Notre Dame is a must and I'd love to just sit for like an hour at a sidewalk cafe sipping coffee... Also want to go to Normandy beach, Versailles, and other local touristy stuff.
As has been already said: consider to ge to the Musée d'Orsay instead of the Louvre.
And a really nice place for sipping café on a trottoir
would be in the area around the Canal Saint-Martin - La Marine, Chez Prune, or Le Comptoir Général (the latter is a restaurant/cafè/bar [with a dance floor], colonial style interieur. Additionally, it's an art museum dedicated to ghetto culture, there is a vintage book and clothing shop ...)
Normandy: even if you just look at one or two of the beaches (museums), it will take some time and driving. When you visit the museum Le Mémorial de Caen
, you have all together (and it's really an extraordinary good museum!).
Instead of going to Versailles, I would visit the Château de Vaux-le-Vicomte
- but that's just my opinion, because it's less crowded and nearly as nice.