Campus Security and RAs are generally a decent and benevolent lot. They're almost always affable, helping students who have been locked out of their dorms or that need a ride back to campus. Some students feel that Campus Security is sometimes incompetent in emergency situations, but they do try to help first and ask later (in alcohol-related injuries). The Spokane police patrol the periphery of the campus regularly, but do not interfere with students much. As long as you don't get way out of hand, the powers that be tend to leave you alone.
Campus Security questions suspect behavior, and students holding keg cups or open containers on campus are probably going to get written up. In the past few years, the school has increased the fines and consequences—you can expect a $100 fine and a mandatory alcohol-awareness class. RAs run the gamut from careless to puritanical; Gonzaga and Spokane police will turn a blind eye to partying, then suddenly fine a house $2,500 for serving minors. Gonzaga preaches strictness, then practices it at random. Finally, be circumspect in downloading copyrighted material. Gonzaga will not punish you, but several times the feds have intervened in the student network and pursued individual students.