....Im a bit surprised that you dont have an established route only a few weeks off, but hey, like I said, stick to smaller roads and there are so many nice places to see and towns and villages close to each other, that you will have fun no matter......
When I bike toured France I didnt even know I'd be bike touring until day 2.... of the trip!
I was going to backpack around, then I rented a bike on day 2 and decided I want to bike tour. So I bought a cheap used "city bike" with a rack and triple crankset, and strapped my small backpack to the rack.... and cycled Albi to Cahors (winding route), Perigeaux to Bordeaux, All around Bretagne.
For future trips I will
plan on bike touring tho.