Park it in a well traveled and well lit area. Secure it to something solid. Why can't you secure it to something on campus instead of a rack outside of campus? Without knowing how your campus is situated in that environment its difficult to give you better ideas.

When I was visiting schools I remember NYU had a pretty open area where it seemed anybody can just walk around. However if memory serves me correctly Fordham (Rose Hill) had a large stone wall and only a few entrances and exits with big iron gates.