Photo: Lienhard Schulz, CC BY-SA 3.0 via Wikimedia Commons
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Not far away from Schloss Tegel (at the "große Malche") you can take a look at the oldest tree in Berlin, an oak which has been growing there since about 1192 (so it's actually older than Berlin itself). The name ("fat Mary") allegedly stems from the brother Humboldt who named the tree after their overweight cook.
Relaxing lake-side strolls on 'Greenwich Promenaid', a path named after Reinickendorf's twin town of Greenwich, London.