clubs?

film society
toastmaster
hiking
cycling
bird / conservation
tennis

etc etc

can be a great way to meet likeminded people.
it is something people have been on at me to do...
a few of my friends have joined up to various things because they wanted a broader base of friends and they said it was really hard to start wtih but they found...
most people were there for the same reason really...
and they had a lot of fun and it did the trick :-)

for me...
i moved back on campus.
hard to be lonely in a hall with 350 other people...