You do not need a ferry to find a great beach in Greece — some of the best are a tram ride from central Athens. The Saronic Gulf coast known as the Athens Riviera runs south of the city through Glyfada, Voula and Vouliagmeni: a string of organized, mostly Blue Flag beaches with calm, clear water and easy public transport. This is a hand-picked shortlist of the ones worth your time, plus the scenic day-trips further out and one genuinely unusual swim. For the full regional inventory, browse every verified beach in Attica.
The Riviera classics — Vouliagmeni, Voula, Kavouri, Asteras in Glyfada and Varkiza — are the easy default: sandy, shallow and family-friendly, 30 to 60 minutes from the centre. When you want scenery, drive south to Anavissos and Cape Sounion, where you can swim below the Temple of Poseidon, or east to the long sands of Marathon. And on a windy day, the thermal Vouliagmeni Lake stays glassy when the open sea does not.