In Palermo we did the Palermo & Ballero Market. This was a good overview of the city, but in all too long of an excursion for what we saw. Our tour guide (who was very cheery) talked too much in fron tof the cathedral. Turns out it was because we couldn't get in yet. Make sure you find your correct bus after the cathedral though or your fellow bus riders could end up feeling like they are in a greenhouse while waiting for you

We went to a little restaurant in a very narrow alley for some local treats. This was pretty good. Then we went to the Ballero Market. I thought this was interesting, but agreed with the previous poster (Gloria?) that it was kind of disgusting seeing the meats and fish in the open market with flies on them. The coffee shop was good though!
In Naples, we were going to take the hydrofoils to Sorrento but the sea conditions were bad so we took the train. We just strolled around Sorrento, tried to find a good place for lunch (the one the locals recommended was closed) and did a bit of shopping. It was a nice day and cost us under 7 Euros each (plus lunch).
In Olbia, we took a break and didn't book any excursions. This looked like a really pretty island and I regret not doing something here. We did take the free shuttle to town and walked around a bit.
In Civitavecchia, we took the shuttle to the port entrance and walked to the train station. The sign outside of the port says the station is 350 meters away. If you take the train, make certain that you validate your ticket in the yellow machine or you could be fined. We got off at St. Peters and walked to the Vatican. We decided that we would skip the Vatican because the line was so long. Instead we did the hop on/hop off bus and started our way around town. We were able to see the tomb of the unknown soldier, the forum, colesseum from a distance, the Trevi Fountain, Pantheon, Spanish Steps. We had trouble getting back on to the bus due to the taxi strike, but finally did get to one and went back to the Vatican. The line was a bit shorter so we got in line. We just did our own tour inside and got back on the train after we were finished.
In LaSpezia, our tour (Wine Tasting & Sarzana) was cancelled. We should have just stayed in LaSpezia or used the train on our own, but instead we decided to do Portofino and Santa Margarita. I will preface this by saying I don't like being cold and we didn't know what this excursion was about before we did it (the description by Shore Excursions is not very descriptive). After we got on the tender I found out that we would be on a boat for part of the excursion. I was already cold. The bus ride to the boat was nice, about 1 hour with some very scenic areas. The boat ride to Portofino was cold and the bathroom didn't have any toilet paper. Once in Portofino I bought an expensive sweatshirt (about $50) to get warm again. Then I felt better and we walked around the city. Soon after we started it started to rain. About 30 minutes later we were able to get the ferry back to Santa Margarita. Here is where the excursion fell apart. We walked about 2-3 blocks to the restaurant. We were seated in the back of the restaurant outside under a permanent tent. The pizza was waiting for us. The seating was very cramped and the pizza was cold. When asked about getting warm pizza, they reheated the pizza which made some of it worse. We were then given 2+ hours to "shop" before getting back on the bus. Only problem was the shops were closed (either due to the holiday or due to it being the afternoon). When we finally got back to the port, we had to wait on the bus for a while before we could see the ship and then a little longer until the tenders were ready for us.
In Marseille, we went on the best excursion by far!! We did the Chateauneuf du Pape and Avignon tour. We were on the same bus as konslerg (Gloria) so my description is the same with one exception. Some of us sitting in the sun truly enjoyed it!!! We were in the restaurant fairly early so we had a choice of the seats and the sun was so nice. I loved this tour because we didn't have a ton of time in each location (though not too little either) but had nice breaks in between.
In Villefrance we did the Nice and Eze with wine and cheese tour. This was my second favorite. In Eze we had only 35 minutes of free time. We found a great shop up on the hill that sold vinegars, oils and liquors. He let us sample everything and he wrapped our purchases up really good for packing in our luggage. I have had a couple great salads the last few days!! In Nice we walked past the antique market (for the 11 night cruises). For the 10 night it will be a floral market. Kind of neat. We went in the basement of a little restaurant and had three kinds of wine, bread and five cheeses. We then had about 30 minutes on our own, but it took about 20 minutes to casually walk back. Enough time for some ice cream though!!