Two days just wandering around on my own and with friends. 360° panoramic view from the roof of Institut du Monde Arabe gave me good understanding of the city layout, the view is really good.
France day 3: Versailles
The day was all about ☞ Versaillles. Took M4 to Gare Montparnasse and local, but fast non-stop train. No railroad strike that day.
I was very lucky as my friend works at Versailles and gave me a private tour. We started at the Royal Chapel, visited the upstairs quarters, joined tourist stream to visit main atractions, returned to the Chapel. I then made a big loop zig-zagging through the park and gardens, watching fountain show, walking to Orangerie at the end. We walked through town a bit, found a nice restaurant for dinner, and returned by RERC and bus to the city center. I walked by Notre Dame, Hotel de Ville and Pompidou Center to my place.
France day 2: Paris
Walking loop to Louvre and beyond, fighting off jetlag and stoping at an agency to arrange Loire Valley tour.
France day 1: Paris
Return to Paris: Chicago ORD âžœ Paris CDG âžœ RER B to Les Halles âžœ Arts et Métiers airbnb@Rue au Maire ➜ walk around neigborhood and to Notre Dame and Pont  Neuf. Travel was easy. No waiting, no crowds anywhere: two hours from Hyde Park to gate at ORD, two hours from arrival at CDG to my airbnb@Rue au Maire. Grocery shopping at supermarche. Longer coffe break. Here is the rest of the afternoon…not much to add.