The Dordogne, a little further than 4 hours, and not necessarily blessed with Eurocamps, but a beautiful part of the country with some great gîtes and chambre d'hautes, whatever you decide on you'll love everything about France.
One tip though, do try and speak to them in French, even if it's only the very basics. You'll probably get away with .... Merci, s'il vous plait, bon jour, pression (draught beer) and saignant (rare steak).
Wherever you end up, enjoy your trip.