I could also say don't miss....................Bordeaux, St Emilion, Arcachon,,,,,,,,,,,,,,well loads of places that are lovely.
I have a couple of pals going across to Santander we of 13th and traveling up to me just South of Angouleme, will be in a green TR6 and an Ice Blue Daimler Dart, look out for them as they have the Euro Classic route maps of precisely that journey through beautiful scenery and countryside.
K