Unfortunately CK is right. There is not alot of Civil war sites here on the West Coast. There are some forts and trading posts, as well as some WW1 and 2 sites but they are really spead apart in distance. There are alot of natural attractions.....as mentioned.
Yosemite is one of them....
There is the Redwood forest
there are several state cave and cavern attractions.
Central Oregon as well as Northern Washington feature many volcanic attractions as well as Native American museums
The Pacific Ocean is it's own thing of beauty, and many attractions all up and down the coast lines of Washington, Oregon, and California.
I suppose it just all depends on what your interested in.
Hope this helps some.......