I did the RS Paris and the Heart of France tour this fall. It covered some of the areas you are interested in. Have a look at their itinerary, you might get some ideas there. We stayed overnight in MSM, which was heavenly, then had a guided tour of the Abbey in the morning. The tour stayed in Amboise for 2 nights when seeing Chateau; I liked Amboise, saw da Vince's home Clos de Luce which was great. Also stayed 2 nights in Bayeux, book early for the tapestry and see their cathedral.
I love markets, I suggest looking online for market days where you are visiting. I have scarves from Amboise and many from Paris markets.
I suggest adding some guided tours or walks, they add so much history. After the tour I spent 2 weeks in Paris where I have been several times and I did a wine & cheese tasting at O Chateau, highly recommended. The area around O Chateau has the covered passages, I did not realize that when I visited and found one by accident, luckily! I had previously found an online brochure with the location and short history of the passages. Nice on a rainy day.
In Paris, Monoprix is a department store, some are large with groceries on a separate floor. Monop' is small with food often packaged in small amounts for picnics or quick meals. One Monop' in the 6th had a great wine area with a staff person to help you choose wine, how wonderful is that!
Enjoy Paris my favourite place in the world.
More later when I find more info on Paris.