I stopped at McMinville a few years ago on my way to Arlington.  This is a flat out great airport!  There is camping on the field with showers.  There is a nice FBO there with pilot food (snacks, candy, microwave stuff, and soda).  But must of all there is the Evergreen Museum across the highway which hosues the Spruce Goose.  The museum folks will even drive over to the airport to pick you up and drop you off.  This is just a great destination if you’ve never been.