Aquitaine, which is the region on the Atlantic coast just North of the Pyrenees mountains, boasts some of the most splendid scenery to be found in France.
I combined my September visit with a stay in the relaxing surroundings of Villa Souvenir, a private property set in its own wooded park in a small village surrounded by enormous pine forests. They offer guided cycling tours which cover areas you would just not get to see on your own. That combined with excellent food, makes this my top recommendation.
Their website emphasises their knowledge in guided cycle tours and cycle training camps in France.