Tourist information:
Due to the recent history Berlin is a city with two city centres. The centre of the old West-Berlin is the Kurfürstendamm (Ku-Damm) with the Gedächtniskirche and the world renowned shopping area (Schöneberg-Charlottenburg). The centre of old East Berlin (Mitte-Prenzlauer Berg) spreads from the Brandenburger Tor to the Museumsinsel. Walking down Unter den Linden you'll pass the Neue Wache, the Berliner Dom and arrive to the Alexanderplatz and the very interesting Nikolai Viertel.
Bus tickets and abonaments:
It’s very easy to visit Berlin by bus and underground, the whole city is reachable by the public transports also by night, a car isn't necessary.
You can buy a two hour ticket for 2,10€ (1,40€ for children between 6-14), a day ticket for 6,10€ (4,20€ for children between 6-14) or a week ticket for 25,40€. More information about the public transports after booking.
Bus line 100 and 200:
The city centre of Berlin is very big and it's not easy to see all the tourist attractions by foot. I think it could be a good idea to take either the bus n. 100 or the bus n. 200 from the Alexanderplatz to the Zoologischer Garten, in 30 minutes you will see the most important tourist attractions in Berlin.
Bus 100 (Alexanderplatz, Unter den Linden, Platz der Republik (Reichstag), Haus der Kulturen der Welt, Schloss Bellevue, Großer Stern, Breitscheidplatz, Zoologischer Garten). Bus 200 (Alexanderplatz, Unter den Linden, Wilhelmstraße, Potsdamer Platz, Philharmonie, Breitscheidplatz, Zoologischer Garten).
Other Activities:
City centre, shopping, museums