Lake Vouliagmeni beach. The best beaches of Attica. Travel Athens . A wonderful place to rest. A mineral lake with thermal waters connected to the sea by an underground cave. There are fish in the lake that do free fish-peeling. When dozens of hungry fish try to eat you, a new emotional experience opens up to your brain and stays there forever. I advise you to try it.
There is a recreation complex on the shore of the lake, the entrance to which is paid. (12-15 euros). Free sunbeds, changing rooms, showers. You can order cuisine and drinks. The entire shore is fenced, you can get to the water only after paying for the entrance.
To get to this place, you need to first get to the end station of the red branch of the metro (Elliniko), and then change to the E22 bus. You need to get off at the Limini stop.
There is also a beautiful beach on the sea near the lake.