Depending on how free you are in the day, go to the movies. Buy an early show of a movie that you've been putting off for weeks. Buy the biggest popcorn and drink. After the first film has ended, make your way to a new film, sneak, of course. Run out of popcorn or your drink? Make your way back to concessions and get your refill. Not into those prices? Bring some outside food in, then do it again after every film. The teens running the ticket-check won't hassle you if you flash a ticket their way, just mention another movie that you haven't seen. Free movies for the day.