Good choices. Yosemite isn't always a zoo - depends on where you go. The east entrance by Mono lake isn't bad. The hike up to June Lake S of Lee Vining is nice and totally doable by kids.
I highly recommend Markleeville area - highway 4 up to the summit is amazing!
thanks for the suggestions for Washington - I don't have much experience in Northwest but would like to go. I have a conference in Vancouver this fall.
