Washington Park isn't Portland, Oregon's biggest park (that's Forest Park), or it's smallest (that is Mills End), or the central park (that is Mt. Tabor). It might not be the prettiest (although it is probably close). But it does have more different types of attractions then any other.
Washington Park is located on the West Hills about 20 blocks west of downtown Portland, Oregon. It continues on for about a mile west, and about that distance north to south. In addition to just normal park type stuff, the park also includes many specialized types of parks within it, including
Even with all this ethnic and botanical hodgepodge lying around, the park looks fairly natural, not like a bunch of tourist attractions lying close to each other.