Here's another thought regarding Yellowstone: From Seattle to West Yellowstone, MT, is about 740 miles - a day and a half's drive. This would make a great one-week trip in the summer, perhaps another year? I'd suggest it for a spring break or fall break, but unfortunately, Yellowstone is pretty-well shut down to vehicular traffic between late Sept and mid-May. If I lived in Seattle, I'd save this one for a trip when I didn't have a lot of time (or money) in a given summer.

Donna