We bought a hop on hop off bus pass which we rode for half an hour before our first stop. That was where I was pick pocketed, so our day of touring was cut off at that point
Our limited exposure convinced us that there was much to see in this city and it is worth more than a day to see it. Watch your wallet though.
Aix was easy to get to, and a very pleasant town to spend a half a day wandering among the narrow streets, looking at shops and relaxing at cafes.
If there was good shopping in Palermo we couldn't find it. The monuments we saw were interesting but not that memorable.
If I were here again, I might go to the catacombs-some of our dining companions went there and they were duly impressed.
We liked our limited exposure to Tunis-a train ride to Tunis to visit the Medina and back. The cab drivers were not an issue-although we had probably a half dozen approach us on the way to the train station they were not particularly insistent. The train to Tunis was a half an hour and inexpensive. What we saw of the city looked very nice-We were expecting something similar to Marrakesh (hot, dirty with aggressive vendors). What we saw was a European like city and the Medina was fun rather than a chore.