Will be in Florence for a few days with my 14 year old daughter, heading to Rome via Tuscany (thinking Siena for the day). Should we train to Siena, hang out for the day then jump a train to Rome? Or should we rent a car and do a day trip to Siena and other places, drive back to Florence and then train straight to Rome from Florence? If we rent a car we could leave our luggage in Florence for the day!?!