So there is no such "finished" cycle path from Berlin to Szczecin. Therefore, it is important to put together the route yourself. This time it actually started right on the doorstep in Berlin, heading north-east. The bit in Berlin isn't bad at all, since it goes a lot through the rather quiet Pankow district. Unfortunately, the path then runs for a longer stretch on country roads with sometimes more and sometimes very little space at the edge for two-wheelers.
You could probably have chosen side routes to avoid this, but I don't know how passable these paths are then. At the end of the path, the bike tour becomes more beautiful, always along the Märkische Eiszeitstraße. Later, the path leads past the Niederoderbruch, along a dyke and then through an idyllic, fairytale forest. Here you are already on the Oder-Neisse cycle path.
Szczecin itself is semi-bicycle friendly. There is certainly room for improvement, but the city offers some cycling routes. All in all, a nice weekend route to enjoy the wide Brandenburg landscape, to work out and get to know a Polish city. And all this without standing at the airport for a long time and "working towards" the travel destination. Here the journey begins right outside the front door.