There’s a special kind of place in hell reserved exclusively for those smug bastards in Berlin who brag about ‘their‘ secret lakes, ‘which they’ve discovered like, 10 years ago or something, and is only 5 minutes away if you crawl slowly, and has pristine waters and an infinity pool set amidst the sunset, and it’s on the way to the asparagus wonder factory, and you can rent Yachts there, too, and it’s so untouched and unspoiled and Hitler used to tan here‘, but then refuses to take you there or share the info with you.
Check dit hilarische artikel op http://www.findingberlin.com/liepnitzsee/
Camping “Am Liepnitzsee”

Take the S-Bahn or Regionalexpress to Wandlitz or Bernau, then bike about 30 minutes to the lake. Don’t walk.