olympia NP
The Ferry from Victoria BC crosses to Port Angeles WA. There is a company there that has a Budget rent a car agency, a hotel and a bus line.
You take the ferry and stay in their hotel right at the station, rent a car to visit the park for several days and then return to their hotel. The next morning their bus takes you to the Amtrack station in seattle
As experienced auto/rv travelers, it is a little disconcerting to rely on others and public transit......but that is the adventure
You have your rain gear packed....right?