Pisa is, of course, known for the leaning tower, and that is basically the only tourist attraction in the city, making it busy and crowded on most days. The tower stands outside of a huge Duomo (domed cathedral) and is now propped up by supporting cables and rods so it will not fall over and crush the unsuspecting photographer.
I thought it was a little tacky how this religious monument was surrounded by tacky tourist stands selling plastic towers and t-shirts. It kind of took away from the history of it for me. Also, you have to pay to look inside the church and the baptistry and there is a hefty line to stand in. And don't even try standing in line to buy tickets to go up in the tower. You could be there for days. Only 15 people are allowed up at a time, for obvious stability reasons.
Besides, the tower, there is not much for the tourist to do here. There is a river in the middle of the city that is nice to look at. There are the obligatory restaurants and hotels. And there is a huge statue of a pigeon in front of the airport that I thought was cool. It was an interesting start to my Europe trip.
This city is more of a day trip than a vacation destination. The tower is about a 2-mile walk from the train station. Just follow the crowd.