The west coast north of California wasn't settled by Europeans until the mid-1800's. The only way to get people and supplies in, and product out, was by sea. Populations concentrate around transportation hubs. There are only two seaports on the Washington coast between the Columbia River and the Strait of Juan de Fuca: Willapa Bay and Grays Harbor.

Driftwood

https://wsdot.com/ferries/schedule/scheduledetailbyroute.aspx?route=pt-key

You will have to apply to the Washington State Department of Revenue. You won't need Turbo Tax, etc. https://workingfamiliescredit.wa.gov/

You could work in a ferry ride by driving State Route 16 north to Bremerton and taking the boat to downtown Seattle.

https://wsdot.wa.gov/travel/washington-state-ferries

The certificate of title and and certificate of registration are two different documents. The title records the ownership of the vehicle, the registration records the current license status.

You should have received the certificate of registration when you licensed the vehicle. That's what you're required to carry. The title should be kept in a safe place - not the car. If It's lost or stolen you'll have to jump through a lot of hoops to replace it.

Another resource is nwhikers.net . Plenty of trip reports but not not so precisely searchable,

Check the trip reports on the Washington Trails Association website . You can search by trail name and date of hike. There are 5 Enchanted Valley reports from March and April of 2022. You should be OK, weather permitting.

Nope.

The weather will be probably be wet and cold. The trail will be in poor shape with blowdown, washouts, and missing footlogs.