Pisa is one of those places you just go there to see that main touristic building and then you move on. In 2009, on my high school trip we visited Pisa. We were probably there for a total of 3 hours. It was a stop on our way to another city and it was more time than needed.
As soon as we got there we had to push our way among a huge crowd of tourists. You cross a gate and to the left hand side is the church to which the bell tower (Leaning Tower of Pisa) belongs to. On the right hand side of the walkway are a whole bunch of vendors selling you everything and anything.