Your message caught my eye because I also would like to take a cruise next year to the Med and the Greek Isles. It sounds like we have some common interests in that I also prefer balcony cabins, I'm a female, 52 years old, non-smoker, enjoy shopping and some sightseeing, love getting glammed up on formal nights, playing trivia, maybe karaoke :-), and going to the shows after dinner. I'm rather quiet, a considerate roommate, and find great pleasure sitting on the Promenade deck with a good book.
I have been looking at a cruise next June on the Brilliance of the Seas roundtrip from Barcelona which stops at Nice, Florence, Rome, Naples, Mykonos, and Santorini. But the one you mentioned on the Grand Princess also sounds nice. I really need to find someone to share a cabin so if you think this might work, let me know. If you want to know more about me, you can go to www.travelchums.com/croozbabe