Visitors of Berlin have a unique opportunity to get to know the city while riding in a Zille bus - the bus stylized to look like his prototypes of the 1920s. The driver, dressed in the authentic uniform, will show you the most notable sights in Berlin.
The centre of Berlin is rather vast, and walking around it on foot can be difficult. Some city buses, however, travel via important sights of Berlin (buses 100 and 200). Among the stops on these routes are Aleksanderplatz, Zoologischer Garten, and more, so taking transit can be a sightseeing tour all in itself.
Another way to see Berlin is from a bicycle saddle. There are many excursion options, but most take around 4,5 hours to complete.