re: Washington State in late June

I’d look at Burlington, Anacortes, Mt. Vernon for your North Cascades home base, then head down Whidbey Island and take the ferry to Port Townsend. Port Angeles, Sequim, Port Townsend are good spots for NE Olympic Peninsula. Port Angeles is the best central spot but Port Townsend and Sequim are nicer.

Things to do in the North Cascades area are La Conner (small waterfront town popular with tourists), Chuckanut Drive (views, oysters, and great hikes) to Bellingham, Washington Park and the drive to the top of Mt. Erie in Anacortes, North Cascades Highway (to Washington Pass at a minimum, Winthrop for the full experience), Mountain Loop Hwy, Mt. Baker Hwy (Mt. Shuksan views), and Deception Pass (which is on the way to the Port Townsend ferry). If you have the time visit the San Juan Islands.

For things to visit in the northern Olympics are Port Townsend, Hurricane Ridge area, and Lake Crescent area. If you want to visit the rainforest and coastal areas of the park you will want to stay in Kalaloch or Forks.