I picked this walk from this book: https://www.amazon.de/dp/3945983789/ref=sr_1_1?crid=3JFTA481X98H&keywords=die+besten+wanderungen+rund+um+berlin&qid=1580534964&sprefix=Die+besten+wanderungen%2Caps%2C179&sr=8-1 (tour No 13: Auf den Spuren Albert Einsteins von Potsdam nach Caputh) – not very far from Berlin, only about ten km, in an almost straight line, along some lakes – so armed with the map in the book, google maps, and two emergency power banks, even I, with a lack of orientation that still astonishes even myself, should be able to not get lost …..).
Incidentally, it is almost identical with tour No 60 in this book: https://www.amazon.de/dp/3945983770/ref=sr_1_1?crid=2ZP094XBT5ZO2&keywords=ab+ins+gr%C3%BCne+berlin&qid=1580535145&sprefix=Ab+ins+Gr%C3%BCne%2Caps%2C176&sr=8-1.

From Potsdam Hauptbahnhof, via Wissenschaftspark Albert Einstein, through forest, past what used to be Albert Einstein’s summer residence in Caputh, to Schloss Caputh.