Camping Varennes in ACSI 1298, midway, Le bois-plague-en -Re, stayed there twice, walking distance to beach.
There is an Aire too don’t know name but think in city St Martins (with star shaped walls?)
We also stayed in one at the furthest point.
Hope to go back this year sometime maybe late May/ early June on our way back up from Spain …nothing booked yet.