40. Swim in the canals on purpose
People (who don't mind smelling funny) have been doing it for years anyway, but now there are more officially clean-and-safe places to take a dip in the Amsterdamse grachten. We recommend starting at Roest.
41. Farm out your fun
Hidden just a 10-minute bike ride behind Westerpark is Buurtboerderij Ons Genoegen ("Neighborhood Farm Our Pleasure"), where the pace of life slows down, even by Amsterdam standards, and the prices are very non-standardly cheap (or even free, at the give-and-take "store").
42. Scream bloody murder at an all-night horror fest
This movie-loving town puts on two a year: Fright Night (formerly known as the Night of Terror) during the Imagine Film Festival in April, and Mr. Horror’s Halloween Horror Show in October. Both pack in a boisterous audience for four films and a whole host of activities, from trivia quizzes to screaming contests, between midnight and 5am.