Well, I'm leaving to Barcelona on November 2nd

I will then be taking a cruise and stop in:
1. Marseille, France
2. Nice, France
3. Florence, Italy
4. Rome, Italy
5. Naples, Italy
6. Barcelona, Spain
I arrive at Barcelona again November 11th and then I'll rent a car and head to Valencia where I'll be visiting the new Ciutat de les Arts i de las Ciencies, designed by my favorite architect, Calatrava. www.cac.es
Then I'll go back to Barcelona to take my plane back to boredom

So, if any of you went to any of those cities and have some tips, advice or whatever, I'll appreciate them.
G.