A reader asked for advice on how to reach Mont Saint Michel from Paris without driving.
To answer questions on Normandy, I would suggest the official FranceGuide Web site (government).
I have no experience or reader comments on travels to Normandy with a group.
The FranceGuide Web site has a section for Normandy and train information for you to check out.
Here is a Web site – WhyGo France that talks about getting to Mont Saint Michel from Paris.
Fat Tire Bike Tours in Paris offers day trips – I know their bike tours are great; they are definitely a company to consider.