Get high in Italy. Seriously, find a church, get to the top (most roofs are accessible for a few euro) and marvel at the Tuscan culture beneath you.
Signoria Square (Piazza della Signoria) is the center of Florentine life. It is surrounded by art and important buildings such as: Palazzo Vecchio, the Loggia dei Lanzi (an open-air art gallery), Gli Uffizzi (the Offices which contain a rich collection of masterpieces), Tribunale della Mercanzia, Palazzo Uguccioni, and Palazzo delle Assicurazioni Generali.