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If you like art, the Musee D’Orsay is amazing.
I like it even better than the Louvre, which is kind of overwhelming.
Maybe a cruise along the Seine, and do some walking in the city.
Montmartre is nice as well as the Jewish quarter.
You can use public transportation and walk, maybe Uber to/from the airport.
See if you can find a hotel bookable on points with 2 beds.
Have a great trip!