We docked in Livorno which was the 1st port of call on this voyage. My wife and I been to Florence before so we did not go to Florence. Instead we went to Pisa. We didn't take the cruiseline excursion because there wasn't one that was strictly Pisa excursion. It was a combination of Florence and Pisa.
We did take Celebrity's transportation at $15/person roundtrip to the Livorno train station. There was another less expensive option of $5/person roundtrip to Livorno Centrale where you would need to take the bus to the train station.
Had I known it was that easy to get to the train station from Centrale then I would of went with the lesser option.
From Livorno train station, my wife and I took the regional train to Pisa which was only 20 minutes and cost only 10 Euros for the 2 of us. We then took the Lama Rossa bus in front of the NH Cavalier hotel. Bus was 2.50 Euros each way per person. Best to get return bus tickets at the news stand at the Pisa Centrale station.
Seeing the Leaning Tower of Pisa was good if you never seen it before. Spent about a few hours and went pack to Pisa Centrale train station. My gosh. Warnign to those who are going to travel to Pisa on your own. We almost got on the wrong train to get back to Livorno because the board had said 'Livorno platform 5" When we went to Platform 5 it said to Firenze (Florence). Went back to the board and later it said Livorno platform 8. Went there and it said Zucca. Luckily we saw someone working there and asked how to get back to Livorno. I forgot the end of the line of this one train but luckily we asked. It started with a "P". Sorry this is no help.
If you try to do trips on your own, you will need to have patience and expect these kind of situations to occur but that's what making travelling great. It's all about the experience.
We did get back to Livorno Centrale train station early so we decided to take bus No. 1 to Livorno Centrale. Some shops were not open until about 4pm on Sundays FYI. Not a big shopping area. Spent about 2 hrs there and caught the bus back to Livorno train station to meet up with our Celebrity bus to head back to the ship.