This somewhat remote spa is part of the larger Salish Lodge complex overlooking Snoqualmie Falls. For folks old enough to remember the opening shots in "Twin Peaks", this is that hotel.
The Spa itself is a little small, but it has a lovely, Asian theme, complete with a hot spa area where you can go and wait between treatments. I had a facial (the best facial I've EVER had) and a European massage here, and it was a truly peaceful, relaxing experience. If you can possibly combine it with an overnight stay in the Lodge itself, you'd probably walk away completely renewed.
Parking is somewhat cumbersome during the spring/summer months due to the Lodge's proximity to the Falls, and the valet service is a little snooty, but these small trials are well worth the Spa.