There were a lot of social acitivities obeing organised by
Erasmus Network Heidelberg (ESN Heidelberg) during the whole time of my exchange.
They organised all kinds of events, from Pub Crawls and Football matches to
hikes and trips to nearby cities and towns (Hamburg, Frankfurt, Stuttgard,
Schwetzingen etc.). Most of the activities were free of charge, or only
required some small payment to cover transport costs and such. I really liked
the ESN events I got the chance to attend.
http://heidelberg.esn-germany.de/
Sport facilities in Heidelberg were also really good. There
was a big sport centre (Sportzentrum Nord) located within the walking distance
from the uni campus Im Neueheimer Feld, and it offered a wide range of sport
activities and classes for the students for free, as well as football, tennis
and basketball courts. There was also a swimming pool (not for free, but with a
little additional cost). More information about sport facilities at Heidelberg
University can be found here:
http://www.hochschulsport.issw-hd.de/index.php?option=com_content&view=article&id=17&Itemid=175
Regarding the student life, it was fairly easy to get in
contact with the other students at different ESN events. I managed to make a few friends with the
Germans thanks to my 2-week stay at the fraternity house (Verbindung), which
was some of the most fun 2 weeks of my entire exchange!
I also suggest to join some club/committee and go to
different social events and trips outside of the lab and off-campus. This is
truly the best way to make friends with the locals and meet other international
students as well!