I toured with another cruise line but booked tours on my own and we had an amazing time!  Athens There is a 30€ package available that bundles several ruins/historical sites together and is of great value. Seeing the Acropolis alone is 20€ so for 10 extra bucks you can see 6 additional sites. We were able to see the Temple of Olympian Zeus, Acropolis and slopes, Ancient Agora and Hadrian's Library in the span of 4 hours or so. Once you are in Plaka, all of the sites are easily walkable. T