Got it. Then if you're someone who wants to hit the high points, for sure do it. I would caution against spending too much time in the Louvre or Orsay. They're both great, but you can really get lost in there and there is so much more to see.
A few suggestions other than the obvious:
- Like I said, the Rodin Museum is my favorite museum. Much more relaxed. You can also to L'Orangerie if you're into Monet/impressionists. It's a quick museum and near the most touristy area, so easy to fit in. Also, the Picasso is close to you in the Marais. I haven't been in a long time and don't remember it well, but take a look.
- Do a walking food/wine tour. There are a bunch of options and they should take you to the markets, cheese shops, wine shops, chocolate shops, etc. A great way to get a feel for the city
- Grab sandwiches or bread/cheese and spend some time relaxing in a park. Luxembourg Gardens is the my favorite
- Make sure to eat as many pastries as you can. They just hit different there. Also, for gelato, Bethillion on Ile Saint Louis is still the best.