France is brilliant for a road trip, the motorways are smooth, and once you get off the main routes, you find all those little villages and bakeries that make the trip worth it. Just watch out for the speed cameras on the autoroutes, they are everywhere, and the fines find you even after you have returned home. To rent a car in France, you can check out what is available here
https://getrentacar.com/en-US/france .