Heads up if you're wanting to take a weekend/day trip to Giverny, Caen, Rouen, etc. this summer. There's a special deal you can get for the Impressionist festival where you get 50 percent off public transportation on the weekends, provided you visit one of the participating museums and have them stamp your ticket to prove you went.
More information (in French) here - http://www.pass-normandie-impressionniste.fr/Pass-Region-Normandie-Impressionniste , as well as a list of participating museums.