I recommend you look into the US101 loop of Olympic National Park. While most of the scenic opportunities (Hurricane Ridge and the Hoh Rainforest) require day trips to get up into the national park itself, they are both worth it. If you can stay near Port Angeles (north of Hurricane Ridge) you would also have a day trip opportunity to ferry to Victoria BC and the beautiful Butchart Gardens. Additionally, while this may not coincide closely with your National Park strategy, perhaps you might visit the area near the mouth of the Columbia River - Cape Disappointment, WA and the Columbia River Maritime Museum in Astoria, OR across the river. You will get a sense of why the call the mouth of the Columbia the “graveyard of the Pacific”. It’s usually quite nice in the summer (not Texas hot), it’s just plain nasty in the winter.