I have ridden the Olympic Peninsula several times. I have ridden Port Townsend/Sequim/Port Angeles/Neah Bay. Also down the east side of the peninsula along the Hood Canal. Also spent some time out around the Quinalt Reservation (your Amanda Park stop). I would say that you should expect to be on 2 lane roads where the traffic (+RVs & trucks) is traveling 50+mph. The shoulder spacing should be adequate for most of the miles, although the fully loaded logging trucks can be intimidating for some. Past Forks, WA the traffic drops significantly. Make sure your tires are durable given typical road debris.

It's gorgeous - I'll look for pics to post.
We have a Forum member (Lascauxcaveman) who runs a Port Angeles hotel very close to the ferry landing.