Hi, my husband and I are staying in Florence in September and would like to spend 2 nights in Tuscany. We have booked a third (and last night) in San Gimignano departing by train at Poggibonsi to Naples. We were thinking of hiring a car from Florence and leaving it at Poggibonsi railway station. Is this possible? or would we be better to bus and train around tuscany? We would like to stay in one spot for those 2 nights and explore from the base. We're not sure where to go and how to travel given so little time. Our key desire is to swim in a thermal pool, is there one around Siena that can be reached by bus or train? Also if we stayed in Siena can we park there with a car? Many thanks for your assistance.