Schools with Hillels usually offer services. These tend to be non-Orthodox and egalitarian. The type of service is usually determined by the Hillel rabbi's preferences. You may have to go off-campus to find a shul to your liking. Chabad is also very active on many campuses.
Most schools have Jewish student organizations.
These can be catalysts for study programs, concerts, Israel fairs and other activities. Start or join an Israel group to educate students about Israel and encourage them to visit. Start or contribute to a Jewish student newspaper. This is your chance to report on current events and express your views. Most of your college experiences will be positive, but you may also confront anti-Semitism on the campus.