Hi 2haw, you are welcome in Charente-Maritime !!! I can see where "sequoia park" is but I have never been there. That looks nice. Know that this campsite is quite far from the beach, and you will be forced to move in VW !!!
If you want to visit the surroundings, I allow myself to tell you some nice corners:
La Rochelle is a very beautiful city (Old port to see)
The Ile de Ré is very beautiful and typical (to do, especially St-Martin de Ré)
Ile d'Aix (small typical island without a car, you have to go by boat), you can see Fort-Boyard !!!
Ile d'Oléron (the closest for you, nice, lots of people in summer), I often go to St-Denis d'Oleron, I love the market !!!
For the beach, île d'Oléron (Vert-Bois or Grand-Village), the Côte Sauvage (Plage du Galon d'or)
If you go on Royan (modern city), do not hesitate to extend the road to Talmont sur Gironde, it is very beautiful !!!
Otherwise, you can drink Pineau des Charentes and I recommend the Cognac with Scwheppes Agrum !!!
The specialty of the area is oysters and mussels.
Have a nice trip !
I use google translation because my English could be better !!!