Just had a chance to look at your routes ...

Are you thinking of following the Velodyssey Route? If so, that's a good choice ... gorgeous beaches, lovely little towns, and you can nip into places like Bordeaux along the way. It's a different perspective on France. We've been to France several times, but did part of the Velodyssey Route on on our most recent trip ... and it was our favourite portion of the trip.
Velodyssey, the Atlantic cycling route ? The Velodyssey

I'd also recommend Chamonix, Mont Blanc, and the nearby portions of Switzerland for something completely different from those lovely beaches along the west coast of France.