Hi Mark
Although I am French I won't be able to help much unfortunately. I have never visited the area...
Depending on whether you are ready to move around, the marvelous Island of Noirmoutier is a 80km drive to the south, and the huge megaliths area (hundreds of them in many alignements) of Carnac is about 100km towards West.
Still, welcome to NG and welcome to France!
Olivier