We would like to visit the following cities as day trips while in Florence - Pisa, Lucca, San Giminiano, Volterra and Siena. We need to group at least two of them as we do not have enough days in Florence. We are leaving two full days to explore Florence. Any ideas please? Any comment or suggestion are most welcome. Any extra information is welcome as well. Thank you in advance. We plan to use trains and public transport for travel.