Portland is famous for a lot of things; tall trees, fresh water, bridges, food carts, good vibes, and the smallest city park in the world.
Mills Ends Park has been an official city park since 1976, but it's more like a 2ft planter box in the middle of a downtown street, so it needed to be skated.
According to our research assistant (Wikipedia) "In 1948 the site that would become Mill Ends Park was intended to be the site for a light pole. When the pole failed to appear and weeds sprouted in the opening, Dick Fagan, a columnist for the Oregon Journal, planted flowers in the hole and named it after his column in the paper, "Mill Ends" (a reference to leftover irregular pieces of wood at lumber mills). Fagan's office in the Journal building overlooked the median in the middle of the busy thoroughfare that ran in front of the building (then known as SW Front Avenue)."
In all honesty the park is a total snoozer and mostly visited by tourists on segway scooters. But when you're in the spirit for adventure, even the smallest tourist attraction can be the funnest skate park.
It was fun for a while, but then the tourist showed up, so we went further looking for more fun. We found it.