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Well-next-the-sea has an amazing beach! Once you are there just ask for "the beach with the huts":

http://www.flickr.com/photos/markophoto/2057955888/

The amazing thing is that it's a marsh and when the tide goes back you realize the actual coast line is like 1km away and you end up walking in the same place you were swimming in the morning. Awesome.

If you get there in summer - busy time, try to go before lunch so you make sure you can get a good space at the closest parking. Otherwise, you will have to park at the harbor and take the little train or walk for a while.