How long is the walk to the "tower". Are there any additional sites to see on the way?

From where?

The Tower of Pisa is located in the area called the Field of Miracles. It's quite a walk, 20-30 minutes, from the Pisa Central train station, to the Field. There are buses that take you there.

Check this out:

http://wanderingitaly.com/video/pisa...i-miracoli.htm

The Tower is closer to Pisa's San Rossore station. Centrale to the Tower is a little over a mile, and San Rossore to the Tower is less than 1/2 mile.

You can search both pedestrian routes on maps.google.com. Use Piazza dei Miracoli for the Tower, Piazza della Stazione for the Centrale station, and Stazione San Rossore for the San Rossore station. Choose the "pedestrian" option on the drop-down menu.

In the Campo dei Miracoli itslef are the Leaning Tower (the Campanile of the Duomo), the Duomo (Santa Maria Assunta), the Baptistry, and the Campo Santo (a walled cemetery). All are worth visiting.

I am thinking of getting a €6 combo ticket to visit Duomo, Baptistry and Campo Santo. I see that there are two ticket offices. Is there a reason to choose go to one ticket office over the other? One is at south of Baptistry and another one is closer to Campo Santo.