Hi there! Although I've lived in San Francisco the last 10+ years, I grew up and attended the University of Toronto (St. George campus) for my undergrad. The 3 main campuses (Mississauga/Erindale, Downtown/St. George, Scarborough) are quite different in academic and social environment. Downtown is the biggest and have most discipline but a big focus on medicine, education, sciences, engineering and humanities. It's also a campus where most students live in a dorm or near the campus whereas the other two campuses it seems, are commuter schools. So I'm sure the attendance rates for parties are higher downtown :) Scarborough campus is also known for business administration. So it all depends on what you're looking for! :) Good luck!