This is my favorite beach. It's Schinias which is close to Marathon and Nea Makri. There are buses from Pedeon Areos (Green Park) that go 5 times a day and stop at Ambelokipi and Ethniki Amyna metro stations. There are several tavernas in the pine trees including Glaros which is open all year. Great place to spend the day after seeing the burial mound at Marathon and the ruins of ancient Ramnous. Because it is shallow it is the first beach I usually swim at every year and often the last, sometime in late November or December.