After a soak in the Radium Hot Spring and our last night in Canada, we crossed the border and had a picnic lunch on the grounds of the courthouse in Bonners Ferry, Idaho. I phoned my father who reminded me that we'd visited there on my first trip from Saskatchewan to Vancouver in 1954.
Driving south on highway 97 through Washington, we saw a sign for the Goldendale Observatory, and stumbled onto what was for many years the largest amateur (i.e. never used by professionals) telescope in the country, see http://en.wikipedia.org/wiki/Goldendale_Observatory_State_Park.
Along the Columbia River we found the Maryhill Museum of Art, http://www.maryhillmuseum.org/, where Diane and Fritz were enthroned in the sculpture garden.