What you can get away with on campus is determined by the strictness of your RAs and your own responsibility. RAs can write you up for being too loud, having too many guests in your room at the same time, and having alcohol or any illegal drugs. Multiple write-ups can cause you to lose your housing rights and land you on a waiting list (which usually leaves you without a place to live on campus). An RA's job entitles him or her to do room checks, making sure students are abiding by the housing contract. Respect the RAs, and they will respect you.
The University of Connecticut Police understand college students are going to drink and have parties. They won’t arrest students for being drunk, as long as they don’t cause disturbances. Also, don’t walk to a party with a labeled alcohol bottle (the plastic water bottle filled with liquor is a popular alternative, so no one knows what you’re actually drinking). Overall, the RAs and police are there to make sure everyone is safe. Don't forget: just because your parents aren't here doesn't mean that there aren't any rules to follow.