Weekly ticket for
Berlin AB (city of Berlin) is EUR 30,00
Berlin ABC (plus surrounding places like Potsdam, Schönefeld Airport, Sachsenhausen/Oraniengburg): EUR 37,50.
No student discounts (Berlin students can buy cheap tickets for one term).
Berlin is a huge and widespread city. You won't get far by walking.
What to see depends of course on your interests.
Berlin has many outstanding museums, Interesting architecture of all architectural styles in the past 200 years,
http://www.fotoblues.net/index.php/145-articles/605-berlin-gebautes-paegt-stadt
street art, night life (from classic to edgy), ...
It is also a really green city with many lakes, rivers, forests
https://forum.skywarn.de/viewtopic.php?t=11688
Edited: 6 years ago