hey Storm, well since i have moved away from Portland i dont mind giving up a few of my favorite/most productive spots. in no particular order
-portland underground (if you have a relationship to get you in, the building i owned for my business had "access" and some of my best finds came from there, but LOTS of trash)
-forest park
-ladd's addition
-of course waterfront park after rose festival, blues festival, the bite..coin heaven, but anymore sadly with the tweakers and bums go with a friend
-the "edge of the world" in southeast just above Tom Peterson's house where all the teen agers go "park" lol I know I did many many moons ago.
-any of the busy parks on the willamette after a hot weekend i could list many
-picnic areas playground areas at Barton and Carver parks on the clackamas and if you dive any of the pits below the rapids along the clackamas river I have found unbelievable amounts of "stuff" in these holes
-Skibowl in the summer (amazing how many skiers lose stuff in the winter and with all of the summer activities at skibowl they lose stuff in the summer as well) underneath the chair lifts
and many more