Don't now if you are down on Duwamish fill, but given your location, please consider a lead test. It can get much worse then lead down there. Be careful.
Also given your location, consider adopting a portion of the duwamish greenbelt. Much of it is city land that could use some love. Soils are less contaminated. More nettles, and probably cleaner, red huckleberries, salmonberry fruits and leaf (raspberry) tea. Blackberry. Learn your mushrooms... inoculate some windthrow with oyster mushrooms. Fiddleheads?
There have been some restoration ecologists who work the greenbelt who might be good tour guides. SUN has an online interactive map that can give you information about your local forest.
http://www.seattleurbannature.org/ has an interactive mapper with species composition by polygon for all public land in seattle.