Crete, mykonos,santorini, rhodes, corfu, Athens and Dubrovnic. All other places during the two weeks cruise need more thought as to how to get to the sights so i recomend an excursion for the other places on the cruise. Enjoy !
Very easy to DIY - Try google and 'cruise ports call boards' - the first result will give you all the info under the Europe section
All of them. You can get a train to katalon to the first olympic statium, a bus to knososis palace, you can then pay something like 10 euros for a tour. If you get up earily enough you can get a bus all the way over to lindos to look at the ruins there and still have time for the beach . both santarini and mykinos i got busess very easily to beaches which cost my daughter and I a couple of euros each way. we went in july-aug this year. The only trip I did was athens and it was well workth doing this for the tour information. often i either found someone on the ship to pair up with for taxis etc or i found someone outside to share a taxi with. we went for 2 weeks and it was great.