In reply to ElBarto:
I know this is too late for you, but for future reference:-
If you have transport, the D-day museum at Bayeux is very good, and there's always the Bayeux tapestry.
Mont Saint Michel is easily doable on a day trip, and Cancale if you like seafood.
Barneville Carteret isn't terribly exciting although market day is OK.
You're not far from Mortain which is also worth spending a day at climbing.