Wannsee is a district with access to Berlin's bigger lakes and the river Havel. Most beaches are easily accessible, swimming is free. There is also a public swimming bath with a nude beach, "Wannsee Beach" (Wannseebad Zehlendorf). It can be reached by using a special BVG public transport service. Take the S-Bahn (stop Nikolassee) and bus 513. Note: Inquire for details beforehand, as the bath is not always open (generally April - September, depending on the weather). Busses run only when the bath is open.