I will be going on the Tuscany and Amalfi Coast tour in March, and during free time in Florence would like to go to Academia Gallery to see the statue of David. A recent traveler review says that "with pre-planning" she was able to get tickets in advance, but there was no explanation how that was done. Searching on the web found comments that it is not a good idea to book online, but a phone call was the way to go. Another says it is important to have the "ticket in hand" (not "will call"). One traveler review said the tour director helped purchase tickets, but can I expect that to always be the case? Bottom line: any information about purchasing tickets to Academia, how to get to the Gallery, etc., would be appreciated.