Sounds like a fun (and ambitious) trip.

I assume you will be driving a rental car and you mentioned a visit to Nice. Please be aware that car break-ins are a serious problem all along the French Riviera, especially when your car has out of the region or foreign license plates. Do not leave valuables in the car at any time. Also, keep your doors locked when driving in town in this area of France; the latest "sport" is young thugs who open doors of cars stopped in traffic to snatch purses.

I don't mean for this advice to frighten you - just be careful and you'll be fine.

Have a great trip.