Just came back from paris, highly recommend trying to see a show at Palais Garnier, make your own perfume class at
https://musee-parfum-paris.fragonard.com/
Agree the Rothko exhibit was fantastic but if you are short on time there is one currently in DC till 3/31 if you want to get there this week.
Have you done any of the cabarets? Moulin Rouge is supposed to be disney/vegas level show girls, we went to Crazy Horse…it was not for everyone, but it was definitely tasteful. I could see going with my 18yo daughter but not sure she’d want to go also with her father…there is nudity but in a very girls night out way.
Shops or walking tour/food around Marais.
Saint Gervais, gothic church that was simply breathtaking and had an organ rehearsal happening as we wandered through was a highlight.