Small Naturist Sites in France

Hallo – Is anyone familiar with naturist holidays in France and would kindly offer some advice/recommendations?

My wife and I (73/70) recently bought a motorhome (also intend to tow our car) and, having experienced a naturist beach in France some years ago, would now like to enlarge on it by taking a naturist holiday in various places in France. We do not wish to visit large naturist sites (not interested in discos etc) so its’ small sites we are looking for.

We intend to drive down from Calais and head for La Rochelle and the Ile d’Orelon then down through Carcassonne to the Med before heading back up country. If anyone can suggest some sites where we can both rest and also take day trips to see various sights it would be appreciated.

Finally it has been suggested that we have a ACSI card what are the benefits?

Thanks to anyone taking the time and trouble to offer advice/recommendations.