At the end of October we will be spending time in Florence and then taking a bus to Sienna for a total of ten days as part of a longer trip. We've built time in for day trips in this area. We're thinking of Lucca from Florence and Montepulciano from Sienna. We had planned an extra day in Florence to go to San Gimignano but I think I'm seeing that it's actually a shorter trip from Siena. We can easily spend one more night in Sienna and one fewer in Florence. Any advice?