At our third cruise port, Athens, we decided to explore the city by bike! We were able to cover a lot more ground to get a good overview of the city, but it did not allow us to visit specific sites (like the Acropolis).
We had a great guide who stopped regularly to tell us myths about the city and the gods... Like why is Athens called Athens:
Here is the short version: Athena (God of Wisdom) and Poseidon (God of the sea) fought to be the patron god of the city. They both presented a gift to the king so that he could choose a winner. Poseidon made a spring while Athena gave the city an olive tree seed. Unfortunately, the spring water was salted so the king choose Athena and named the city Athens.
Here is the slightly longer version: https://www.greeka.com/attica/athens/myths/athens-name-giving/
One of the best stops on our tour was at a local bakery where our guide bought us some traditional Spanakopita, Bougatsa (a traditional dessert), and other delicious treats to taste :)