Somewhere I read that it was one of the most visited tourist attractions in France. However, I would not make a special trip to go there. At the base of the mount, the path through "village" is all shops selling trinkets and touristy things and food stalls. As I recall, we took an alternate path that avoids most of these stores. I would prefer to walk around a small town like Dinan, which, by the way, is close Mont St Michel (less than 1 hr by car).
In Normandy, I liked visiting the WW2 museums and sights, cemeteries (I recommend visiting not just the American one, but also a German one, I think we went to one in La Cambe).
Go to Giverny if you're a Monet fan.
E82 135i 6MT/ZPP/ZSP/6FL/Comfort Access/Heated seats --ED Sep 18 2008-- Delivery pix
E61 535xi Step/ZPP/ZSP/Nav/6FL/Heated seats --ED Aug 31 2007-- ED Report--N. Italy
E90 330i 6MT/ZPP/ZSP/Nav/Comfort access/Heated seats --ED June 26 2006-- ED Trip Report
"Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?"- George Carlin