2) I don't mean in the dead of night or when you're sleeping or whatnot. I mean, when there's a decent deal of foot traffic in the halls. People do this all the time in college.
Look, don't be paranoid. When I started college, this girl on the floor above me had anime posters, so I dropped by and introduced myself when she had her door open one day. We're still friends, 6 years later...
3) Very good. Find more than just one club, though.