Art:Berlin offers guided tours on real live art and culture.
Address: Kufsteiner Strasse 7
(subway 1, Nollendorfplatz)
Office hours: Monday through Friday 9 a.m. - 5 p.m.
The Bruno Winkler shipping company is located near Schloss Charlottenburg, so you might consider combining these two. You can go on boats at the Schlossbruecke at Charlottenburger Ufer and will see a lot of the inner city. Info: Mierendorffplatz 16 (Wilmersdorf), subway stop Mierendorffplatz (U7).