Thanks to both of you for the positive comments and advice!
I have booked private shore excursions for my clients and me in Naples, Rome and Florence. If I were by myself, I would probably just head out alone and wander, but I want them to really get some good information.
In Barcelona, we will be staying in an apartment for an extra 4 nights post-cruise, and I have some great things planned...tapas, cava, shopping, Montserratt, winery visits, market visits, cooking, the HOHO bus.
I am glad to read all the good things about the Gem. It is my first time on NCL, but I have clients who won't cruise any other line!
I will let you all know how the cruise is when I return the 20th of September.