Jeeez, that looks like a great ride, beautiful route. Plus, August is the driest time of year, so you have a high probability of perfect weather. I may sign up for that one too, wow!
You have a layover day in Port Angeles, so you can do a ride up to Hurricane Ridge in Olympic National Park, OR, you could get up and walk onto the first sailing of the Coho Ferry to Victoria BC for the day and take the afternoon trip back. Victoria is a beautiful city and the ferry docks right downtown.
https://cohoferry.com/The-Route

I definitely give this ride the thumbs up, way up.