Exploring the Snohomish River Ecosystem
The map below identifies a number of points of interest for walking in the Snohomish River estuarine environment. There are layers for walks and for beer. (To keep it phone friendly, I'm linking the image out to a map.)
This "digital story" about Snohomish River salmon also does a great job of explaining what is so unique and interesting about the Snohomish River ecosystem. Kudos to the Washington Department of Fish and Wildlife for this.
The Tulalip Tribes Natural Resources division also does a lot of work in the estuary and their site is well worth checking out.