Hi scmom :-)
I 'd suggest heading over and reposting in Cruise Critic. That's a "sister" site of Trip Advisor, where sea cruises are discussed. You 'll find hugely lot more help there in the "Cruise forum: Greece ports", here: boards.cruisecritic.com/forumdisplay.php… .
Other than that, a cruise is a cruise. It's fast, lot of people. It is a good way to see a lot of things in a tight schedule + you don't change rooms from location to location. Nevertheless, you also lose a lot, since you never overnight in any of these places and you are tied to the cruise ships itinerary. It's impossible to "experience" an island in some hours, still you do get a taste :-)
Other than that, Celebrity is always an exceptional company, so you can't go wrong with them. They are a bit on the "big" side these days as most cruise carriers though.
We haven't taken the Celebrity cruise but, in 2008, we took a similar type cruise to the Greek islands on another major cruise line. Wouldn't do it again to experience the Greek islands or other history-rich Mediterrean ports. By the time you disembark from the boat and make your way to the sites you want to see, you'll barely have enough time to snap a few photos, visit a few touristy shops and maybe grab a quick lunch (most likely at some touristy restaurant), before you have to head back to the ship. This is especially true for Santorini where you'll have to tender to shore and take the cable cars up the cliffs to Fira. We have friends who love the cruise experience; for them, the cruise itself is the 'destination' and the port stops are the icing on the cake but not their primary travel objective. If you want to experience Greece and her islands, you will need to spend 3 or 4 days at least at a location, get lost a little, talk with the locals, find those out-of-the-way villages, beaches, tavernas... Maybe I'm jaded but not even sure that a cruise stop will give you a real 'taste' of an island; sort of like saying that a TV dinner will give you a preview of a truly fine dining experience with the wine, music and ambiance.
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