Hey there... I'm from Vancouver and I couldn't resist telling you about it...
-transit system is decent and as a student at UBC, you'll get a UPass (good in all zones, all times, for bus, skytrain, etc)
-Olympics are going to be here next year!
-doesn't get too cold in the winter (usually only 1-3 snowfalls a year)
(as a student at UBC, you can get a wicked deal on a season pass)
-tonnes of outdoorsy-type stuff to do
-some fun clubs downtown (although I admit I haven't gone to any. The Roxy is pretty popular)
-every summer there is a fireworks competition (usually four different countries compete), down at the water.
-in the winter, it RAINS. A LOT. Think Seattle. An umbrella becomes a necessity.
-the buses to UBC and SFU (other major uni here) can get super crowded. Transit is working on it...
-it's expensive to live here (e.g. my tiny basement suite is ~600/month, and it's in Burnaby--- about 45min on transit from UBC)
I don't go to UBC, but it's a very good school with lots of great professors. I have lots of friends who went/go there and like it. It's a very expansive, beautiful campus. It also has TRIUMF, which I'm sure you've heard of already.
Hope this helps!
I am actually thinking of going down to Cali for grad school. I'm interested in Planetary Science, Astronomy, and Astrophysics. If I come up with a specific question I'll ask you