A tip for sporting guests:

Not in Berlin but only an hour away a good choice for cyclists and inline skaters - 11,12, 43, 48, 50 or 92 km - everything is possible
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And now my personal tip - But psst!, please. Mum's the word! After the tour you could go the Webhaus - museum-cafe in Kloster Zinna - to have a cup of coffee and a piece of cake homemade by th chiefes. If the weather is fine one can sit in the lovingly tended garden!
Berliner Straße 72, 14913 Kloster Zinna