• Busy on summer weekends, when the Waldbad beach fills up, so arrive early or pick a weekday
• No car needed: take the Heidekrautbahn to Wandlitz, or the S-Bahn to Bernau and a bus to Waldsiedlung, then walk about 30 minutes through the forest
• Nude bathing area on the island, a signed FKK beach along the main path on Großer Werder, worth knowing before you take the ferry

Liepnitzsee is a spring-fed lake in the Barnim forest, with water clear to about 5 meters and beech and pine woods down to the shore. The Waldbad on the west shore has a sandy beach and boat hire: rowboats, canoes, kayaks and pedal boats.

A seasonal ferry crosses to Großer Werder, a wooded island with a campsite, and a paved forest path circles the lake in about 8 km.