We figured that seeing as Athens is a short train journey from the ocean, it would be worth our time to head to the port and book a ferry to visit a nearby island. The most accessible port from Athens is Piraeus, which is a 20 minute train journey away from the metro station Omonoia (the green metro line took us directly from Omonoia to Piraeus for a mere 2 euros). When we arrived in Piraeus, we found that there were many ferry booking agencies and so inquired at a few about prices and nearby islands. We decided on Aegina, which was the nearest island from Piraeus, and paid a very reasonable fee for the ferry.
The ferry journey took about 40 minutes, and it worked out that we had 6 hours to spend on Aegina before our ferry journey back. As 6 hours is not enough to see and do everything the island has to offer, we decided to just spend the time relaxing on the sea front. After spending days in the city, it was very satisfying to sun bathe and swim in the warm sea. We also indulged in copious amounts of ice cream and fruit, and took a horse carriage ride around the town.
Our ferry journey back happened to be at sunset. This was not planned, but we were very pleased about this, as the photos below will probably tell you.