Global Friends organizes a lot of events for Erasmus students. I went to the welcome party, a boat trip and salsa dancing lessons. There is definitely plenty to do and lots of other Erasmus students to meet. There were also other Erasmus students staying at the same halls of residence who were studying different courses which was a good chance to meet non-dentistry people. I went on two large group trips, one to Riga, Latvia and the other to Tallinn, Estonia. We also went on a trip up to Abisko national park in the Arctic Circle to try some cross-country skiing and see the Northern Lights. I would definitely recommend a trip up North, it requires some forward planning as there are only a few hostels which tend to book up quickly.
Stockholm itself has lots of different museums and galleries. We were invited to the City Hall, where the Nobel Prize's are given out, for a welcome from the Mayor followed by dinner. Gamla Stan (the Old Town) has an interesting Nobel Museum and the royal palace, as well as being an intriguing place just to wander around. There is lots of green space, and a short underground journey takes you to Skogskrkogården, which is a UNESCO world heritage graveyard.