Public land in Duvall and Carnation isn't terrible. Get out there early, you can find a spot along the river, bring a pair of brush clippers for stickers and a machete. You might want to go out and find your spot on Saturday afternoon, cut down to the river then hunt it Sunday morning. I used to do it that way in High School. Cut yourself a hole to get to the river. Keep it your secret and hunting can be pretty good. Don't make it a big obvious trail. Most ducks in that area are pretty call shy. Don't over do the calling. Toss a few decoys, try to find a spot which is slow water and fairly safe. Some places you fall in and you can't get back out, those are no good for anyone-