I have ridden all these roads over the past 30+ years. I would take HWY 3 from Bremerton to Shelton, then be sure to take the little country road up through Matlock. This is the gem of the route, and it is paved. There will be little traffic and lots of woods and local character. Then go through Aberdeen and out to Grayland, as others have mentioned. From there, Raymond, South Bend, Naselle and across the Astoria bridge. I rode the bridge in the almost dark, in the rain, and did not find it so harrowing. It is the only place I've ever seen a road-kill starfish, though. I would have a mirror, of course, but I always have one no matter where I'm riding. This is all a great ride, and I've never felt any real danger on any of it. Have fun, and don't miss Matlock!