Per the usual, I did nothing. I always went trick or treating as a kid though and dressed up and even sometimes wore a costume to school. This was when I was young......very young.
Nowadays I do nothing. There was this rumor going around school, when I was in Middle School/High School that police were arresting people our age because there was an age limit all of a sudden for Trick or Treating and we couldn't do it anymore.
I never really got that resolved but logic tells me it was false, but it has always stuck with me.
Anyway, now that I'm always at college for Halloween, it's strange. Now that I'm in a certain dorm, I like to look out of my window at night to see other people across the street in the 7-Eleven parking lot and that's kind of what I did throughout Halloween night.
Makes me feel less alone. I do that a lot on weekends in general.