I can thoroughly recommend Ile de Re, which is a small island off La Rochelle - you can actually drive to it from la Rochelle via a toll bridge. We have visited there three times now and cant wait to go back. The island has 10 small villages, some of which are not much more than tiny hamlets. I know there are holiday villages and apartments on the island, but as there are only two of us, we stay at a Hotel.
I know there is a Pierre en Vacances on the Island, (in the capital St. Martin) and it looked quite nice, but we did not stay in it.
La Rochelle is also lovely, much to do in general around that area, we went to visit Cognac and came out of the Hennessy factory pie eyed.
Even thinking about it makes me want to go back now.