Hi from Wisconsin,
Not a question, but a resource. A recurring question is: What can I do that is near Paris? There is a book, An Hour From Paris, by Annabel Simms. She identifies 20 locations accessible by mass transit. The book is supplied with a general transit map, and then each location has its own map. Paper maps, how charmingly out of date, but so handy when you sit down to read and it is right there. I picked up a copy of the book on eBay for a few bucks.