We are finalizing our Italy plans and want to include seeing Siena and then traveling to Montalcino. I have found a tour from Siena to Montalcino which includes wine tastings etc. It looks really nice and begins at 2 and ends at 7PM. If we took our own transportation by bus from Florence to Siena, would we be able to tour Siena on our own prior to the tour? What guidebook would we need to enhance our short time in Siena, and when is the last Sita Bus back to Florence? I have found the schedule from Florence to Siena. Still searching for the return.