After a morning at leisure this afternoon, you'll enjoy a drive along the coastal road, passing the wonderful beaches of Glyfada, Vouliagmeni & Varkiza to the most Southern point of Attica, Cape Sounion, where the white marble pillars of the Temple of Poseidon stand. On the way, you have a splendid view of the Saronic Gulf and the little islands offshore. After visiting the Temple of Poseidon, you have time to walk at leisure on the rocky promontory of Sounion. You'll return to Athens around 7:00 pm.