The colombians I met during my exchange was in general open minded and warm, I quickly made friends with my classmates at university and my flatmates.
The University offered some activities through an international student organization. I did not participate in any of their activities but the impression I got from the organization was nice.
In the university there is a gym, football field, playstation and board games. All these activities are available for all students who study in the University.
I did try to be very efficient with my time in Colombia. I studied long, hard days during the weekdays and then took weekends off to travel in this amazing country. Colombia is rich in culture and diversity and offers mountains, coast, beach, jungle and urban metropols. Writing a tesis is time consuming but if you are efficient you are able to explore the country were you do your exchange as well.