Last night, it became legal in the state of Washington for anyone over the age of 21 to carry up to an ounce of cannabis or 16 ounces of "solid cannabis-infused goods" such as pot brownies. However, that doesn't mean you can just head outside, walking into the middle of traffic on Dexter Avenue and start toking. There are a bunch of places in and around Seattle that you're going to want to steer clear of when it comes to smoking marijuana, which is still illegal as far as the federal government is concerned.
University of Washington - Because their students students receive federal Pell grants, the University is going to respect federal law and keep weed illegal on campus. Same goes for Seattle's North, South, and Central Community Colleges
Federally-Controlled Land & Buildings - Since it's still illegal to smoke weed according to the federal government, don't go smoking weed on federally-owned land such as federal parks, courthouses, buildings and military bases.
Anywhere You Can't Drink Alcohol - A good rule of thumb before lighting up is to ask yourself if a cop would arrest you right now if you were drinking a beer. If the answer is yes, then you shouldn't be smoking marijuana in that park or public place you're hanging out.