If your cruise ship is in Athens for the day, a visit to the Acropolis should certainly be on the list of things to see in Athens. Most cruise ships dock in Piraeus, which is about 30 minutes to an hour from Athens (depending on the traffic). Most cruise passengers will take a full or half-day bus excursion into Athens. However, for those who like to tour on their own, trains are available from Piraeus into the city, and the station closest to the Acropolis is the Thissio Station. (Information and Map of Athens Metro.) Be sure to check with your cruise ship about directions and current information.
Most cruise ship excursions include a walking tour of the Acropolis. Buses stop at the base of the Acropolis, and visitors walk a long, winding trail up the rocky hill followed by 80 steep, slippery steps to reach the summit. When you reach the top, the views of the temples and the city of Athens below are spectacular, making the climb well worth the effort.
The site will likely be very crowded since travelers from around the world are all attracted to this important historical site. There are restrooms available before you reach the ticket gate.
As you climb up the winding path towards the steps the Odeon of Herodes, an ancient theater, will be on your right.
After your tour of the Acropolis, don't miss the Acropolis Museum, which is located at the foot of the hill.