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Mooseketeer surely provided some very good information and I would also recommend the Dordogne area of France. There are many old towns (and castles) in the area, such as, Sarlat, a very well preserved medieval town in a scenic location. Not too far to the north is the Loire River, which has some of the most stunning castles one could ever see. They are relatively close to each other that in one day you could visit most.
I have made several trips by car within France and found driving to be the most convenient way to get around. On the main roads most people are hustling to get from point A to B as fast as possible. Plus there are many trucks. To avoid traffic I usually stayed on small country roads which were peaceful and cars were very rare.
As for visiting museums, historic buildings, etc. it may be good to check on the days they are closed. For example, most in France are closed on Mondays- the signs will read: Lundi Ferme. In Switzerland I think the tradititional closed day is Tuesday.
An economical and good way to eat in France is at one of the many Self-Service restaurants. Most cities have them, and they are open usually for the midday and evening meals only. They function like cafeterias, you get a tray and go down the line, choosing what you want. This eliminates waiting for a table, waiting for your food, etc. The prices are reasonable and I've always been satisfied, especially with the little bottle of red wine at the cashier.