Planning a trip with my all adult family (5). We will be traveling in the 3rd week of May for 12 days. We will arrive in Barcelona and depart from Rome, Italy. We will stay a few days in Barcelona and the travel to Nice, Florence and Rome. Should I rent a car or travel by train. My husband and I are paying for all. How difficult is it to drive in Europe. We have traveled by car to most states in the US and owned a GPS system. Can you recomend a itinerary for us. What sites should we see along the way? Any suggestions on hotels would be great.