A few summers ago I went to Arcachon, located just south of Bordeaux on the Atlantic Coast. It’s a favorite seaside destination of mine, easily accessible by a direct high-speed train from Paris. France is blessed with three coastlines: the Mediterranean, the Atlantic and the English Channel.
Here’s a two-minute video of the jetty which stretches out over Arcachon Bay. Just beyond is the island of Cap Ferret. I can smell that fresh, ocean air and hear the gulls wheeling overhead right now.
Below is a post with photos of Arcachon and Cap Ferret, as well as a good hotel recommendation.
https://julietinparis.wordpress.com/2013/08/19/arcachon-and-cap-ferret/