Some other things to see:
In Washington:
Olympia National Forest--the only rainforest in the 50 states of the United states (there is also a rainforest in Puerto Rico, which is part of the United States, but Puerto Rico is not a state)
Space Needle in Seattle
Experience Music Project and Alien Museum--both of these are at the base of the space needle
Snoqualmie Falls--east of Seattle, this falls is actually higher than the famous Niagara Falls
Mount St. Helens monument--tells all about and has a film on the volcano that blew up back in 1982 and left the entire west coast blacked out for about 2 weeks
In Oregon:
Portland--the Rose City
The Snake River Gap--about 80 miles east of Portland--very scenic
Crater Lake--a giant lake created when a meteor hit the state millions of years ago and created this giant crater
Ashland--very scenic city and home of a giant Shakespeare festival each summer
In California:
Redwoods National Park--extends from the Oregon border down about 30 miles south. Be sure to visit the famous "Trees of Mystery"
Napa and Sonoma Valleys--recognized the world over for making (along with France) the best red wines in the world. They also have pretty good reds, and there is also a brandy maker close by. The city of Sonoma is great, has some really good music festivals, a cheese factory in town, and is just a wonderful place to be.
Muir Woods--just north of San Francisco--has some great redwoods and 'foggy vistas".
Sausalito--just across the bay from San Francisco. Another quaint, beautiful town to visit--good restaurants and great shopping, too.
Enjoy