I have ridden down both the Hood Canal and the Washington Coast to Tillamook on the Oregon Coast. I would disagree with those who say that the Washington Coast isn't worth riding. There are rivers, lakes, forests, ocean views, and not much climbing. While it isn't as dramatic as the Oregon or California Coasts, there are few places in the world that are. I wrote a journal of that ride, which started in Bellingham, WA and ended in Newberg, OR, just south of Portland. It contains hundreds of photos that will show you what riding this route looks like.

I didn't ride over the Astoria bridge and, after seeing it, I wouldn't. It is a long, steel girder bridge that often is shrouded in fog. I opted to ride east to the town of Cathlamet, WA, ride over a bridge with a bike path to an island in the Columbia, and then to take a ferry over to Oregon.

While I didn't particularly fancy the ride west to Astoria, I liked the town, spent a rest day there, and really enjoyed its Maritime Museum. The ride south from Astoria is, as people have said, uninteresting for many miles. Though, I don't recall it being worrisome. If there is a more interesting route, I'd suggest considering it. But, be aware, it may require some significant climbing.

I have never ridden the Oregon Coast south of Tillamook, or th California Coast north of Fort Bragg, so I can't comment on it.

Have a great ride, whatever route you choose.