La Rochelle Area

Please help us only  3 weeks to go now, first we hope to try La Rochelle area, then back towards Concarneau. Would like one site Beach and the other Inland, 2 Adults with no kids or dogs.Near towns any help with sites would be great have been looking for so long now and getting fed up hubby said he wants to book before we leave as he does not want to be driving round looking for sites this is our first to France with our Caravan. I do not want to book just any site as we have looked at so many and are getting really frustrated Thanks everyone