We've been there several times. It really is a gorgeous region for photography, and the food's not too shabby either.
There are so many opportunities, the best thing is to hire a car and just drive (if you're going for more than a couple of weeks, check out the Renault / Peugeot / Citroen "Euro Drive" schemes).
Pick the D roads and just discover the area. Pick up a Michelin guide if you want to get a good idea of what's where. Early September you may need to book some accomodation, but it shouldn't be too bad, as most people have gone back to work. Try the "Gite de France" and Hotels de Charme for accomodation.
Fabulous scenery, great history, great food.