@cardinal93 : sorry to jump in late
On your way down from Tours (I guess you will be checking out the renaissance chateaux all along the Loire river), I would recommend to ride down to La Rochelle, whom city center and harbour history get back to XII th century.
Then Bordeaux. I guess there is no need to tell you how attractive the city is ;-). But apart from wine, the city is a real charm.
After what riding all the way down to the Pays Basque (Biarritz, St Jean de Luz) is a must. Then you can head to Pyrénées.
On your way up, making a stop in Avignon and the Luberon would make sense. While you're at it, head up to Lyon and then go through Bourgogne. Finally, I would consider making at least a stop in Paris !
Anyhow, welcome in France and enjoy the ride.
Feel free to ask.
Bertrand