Tiergarten flea market, U6 Reinickendorfer Strasse, Berlin. Open Saturdays and Sundays, 10 a.m. to 6 p.m. Free admission. This bustling open-air flea market's offerings are as varied as stamp books, Art Deco furniture and German china.
Kunsthaus Tacheles, 54-56a Oranienburger Strasse, Berlin; http://www.kunsthaus-tacheles.de. This abandoned former department store, covered top to bottom with graffiti, has been taken over by artists, many of whom live in the building and sell their art from their rooms. Most artists open their studios and exhibitions in the afternoons. Open daily. Free admission.
Rosengarten, 10119 Mitte, Berlin, http://www.rosengarten-berlin.de. This large park is frequented by kids of all ages, with a wading pool for toddlers, an extensive playground for elementary schoolers and an outdoor bar for adults.