I go to UBC in van, but Ive spent my summers just outside of thunder bay since I was really young. I can't really speak for Lakehead too much, but my cousin went there you should PM him with some questions (username: tbayskier). I'm personally not a fan of the city of thunder bay. The 'party' scene is kind of funny to me there. Lots of 'tough guys' causing commotion, I'd say its a lot different than Van in that sense. There are definitely a lot of unique people in tbay though which is great and it seems most people can bring something unique to the table. Definitely a good place if you're not afraid of the cold and like the outdoors. access to some sort of boat is a must!
as for skiing I think the most reputable ski area there would be loch lomand- awful park if that's what you're into, but definitely enough little hits and jibs to have some fun. definitely a big racing scene there too.