It's hardly a coincidence that the word "muse" appears in "museum!" Gerhart-Hauptmann-Museum aims to inspire and entertain visitors, so consider adding it to your schedule.
When you've spent a bit of time at this Erkner museum, why not check out Mueggelsee, Badestelle Kleiner Müggelsee, and Köpenick Rathaus? They're not very far from Gerhart-Hauptmann-Museum and also a hit with many tourists.