I strongly suggest a weekend in Tzia, it's close to Athens (only one hour from Lavrio port), it's beautiful and its has TONS of perfect beaches!! The pictures are from a beach called "Sukaminia" which is only 25 minutes away from the port. It has trees you can lay under, you have to (definetly) buy water from the port since there isn't anything down there. Since the most part of Tzia doesn't have asphalted roads, you have to go with a car that can handle dust-roads! The best map/travel guide is from road editions. TRUST ME!! ITS PERFECT!!!!