I will be in Athens for one day and am looking for suggestions on the best things to do given my short stay. I will be arriving via a cruise ship early morning and departing in the evening on the same day. Any ideas on what I should see? Is it possible to do Temple of Poseidon, Temple of Olympian Zeus, Acropolis and old Olympic Stadium in a day?
Hiring a private car or doing an excursion is one option, but I am looking to save money and just explore on my own.