Congratulations on getting in and making your choice. I'm sure you'll have a great time (I suppose I'm biased toward Computer Science programs, though, being in one myself... going on 3rd year at
Queen's University at Kingston. If anyone here is going there I'd love to know and answer questions/what not, feel free to PM or e-mail me).
I'm not sure at what point newly admitted people are allowed to register, but, you could try checking
Facebook (many Universities/Colleges have FIRST Alumni groups now and there's threads on Chief Delphi about some of them).