We are travelling Italy by train - first time visitors - but will hire a car for a couple of days to see Tuscany. We are staying just outside San Gimignano. My husband would like to visit Lucca, Volterra and Siena, but is apprehensive of the driving. It is easy to park outside these towns and get in? Advice would be appreciated. Also, we would only have an hour to two in each. If this is the case, should we skip some and focus on just one or two?