You already know a few good spots in the Snohomish, Sky, and Stilly. Learning to fish those three rivers should be enough to keep you busy for a couple of years. With those picks you should have something to fish for throughout the whole year. Steelhead in winter and summer (spring is questionable), cutthroat, humpies, silvers, and chums in the late summer to fall. Nobody's going to give away their favorite small creek on the internet. Just make sure you know the regulations for each time and place you fish.