We spent a couple of days on a spontaneous break on the coast at Deauville (touristy) and Honfleur (quaint and very touristy). Great seafood restaurants, sea-front markets, and, being early in the season, not too busy. You can start the day with a nice slow coffee by the harbour, and pick your way slowly round the shops, whiling away the time before a lunch of fresh fish. A beer in the afternoon whilst reading your latest BD. And so through the day.
If you have any musical interest at all, you must visit the museum of Erik Satie in Honfleur. It takes about an hour to go round and it aims to be as quirky and irreverent as the man himself. It is very well done.