Regarding tours and whatnot for Berkeley, I seriously recommend exploring the campus and surrounding areas on your own as well. Seriously, Berkeley is riddled with tons of cool view spots, parks (not People’s Park, don’t go there haha), restaurants, and so on that really make it really unique.
At Cal, as far as what I observe (via friends, my girlfriend, and so on), social life is what you make it. People often make really great friends by getting involved in various organizations, or somehow settling upon their niche.