Went down the West coast to Bordeaux then into Spain via Pau and the D934 amazing views and a good road for a bike, plan to go over that way
Came up the east coast on the way back, not as interesting till you turn inland. I went through the Lott valley and over the Millau bridge, 80mph on a autoroute with the footboards scraping on the deck round the bends (scared a few cars I think)
Both ways have good bits but the D934 over the Pyrenees is amazing.
Have fun
Pierre