Welcome to Berlin!
In order to get an overview of this huge city, it's best to take the City Circle Bus Tour to get some sense of orientation. (That's why we usually do this on our second day of orientation.)
During summertime, buses drive around without tops -- magnificent views guaranteed!
All buses are equipped with headphones through which you get a guided tour covering virtually every point of interest in Berlin. Busstops are always close to the special sights you want to see - and you can get on and off as often as you want.
If you do the full circle without getting off at first, you'll be back where you started after 2 hours and will have gained a pretty good sense of what is where. Take a virtual tour below!