In reply to red.stiletto:
Dordogne/Bergerac/Cognac - rivers/lakes/pools rather than the sea - not as hot, plus there is usually shade for the kids. Lots for everyone, scores of houses to rent. Crags (hot for that though, but le ceou is good, or Les Eaux Claires). There are also ecole d'escalade grid-bolted crags for kids. Canoes, bikes, wine, castles, markets. If you're closer to Cognac your're within range of the sea at Saintes if you want to fry.
This year, half of our contingent are flying, the rest driving with the luggage. Just N of Bergerac this year.