Beautiful awesome hike. I decided to do the loop counterclockwise, during the first leg you look over lake Ann and keep climbing up to a spectacular view. While up at the pass, it's a good idea to have lunch, relax, and enjoy the 360 degree view. On the way down you pass through a beautiful flower field (take it slow here) and an occasional marmot. Towards the end it is a bit knee jerking but it is over quickly enough.
The trip out there from Seattle is a bit long and I would suggest taking SR-530 to 20, it seems shorter and 530 is just a beautiful route. Make sure you have a full tank of gas before entering the pass.