It may be too late to make this recommendation however, there is so much more art of the Renaissance and by Michelangelo in Florence then the David, many are in churches which cost nothing or charge a minimal fee. We elected to opt out of the Disney excursions in favor of hiring a private tour company. The tour company picked us up right at the dock immediately on disembarking around 8 a.m. and took us to Florence. I had outlined a specific itinerary in advance with the tour company, who was not only more than willing to take us to all of our destinations but had some of their own suggestions and were more than happy that we chose some more obscure and unusual venues. If you are going to see and enjoy Renaissance art, consider visiting the tombs of the Medici, the Laurentian stairs, the bronze doors of Ghiberti, in addition to the tombs of Michelangelo, Galileo. We were able to spend 8 hours in Florence and were taken back to the boat with plenty of time to board. Honestly, we booked private tours with all of our stops on our Med Cruise in 2014 and never once worried about not getting back to the ship on time. All of these reputable tour companies are very familiar with deadlines. While it might be slightly more expensive to book the private tours, the advantages are numerous including writing your own itinerary and not having to wait for other Travelers who may not travel at the same pace that you do. We are not shoppers and have no interest in stopping at tourist traps which were conveniently avoided by booking our own tours. We booked the pvt tours in Florence, Rome, and Athens. Best of luck. Be sure to research everything before you go and consider all the options. Both my husband and I had previously been to Pisa but felt our children would get more out of Florence. Pisa is just not that interesting.