If you have Craig Romano's "Backpacking Washington", take a look at trips #52 and #53. We merged elements of those trips into our own loop from *I think* Sept 7-10 of 2013. Starting from the Sloan Creek Campground off of the Mountain Loop highway, we climbed up the North Fork Sauk River Trail, explored Red Pass, White Pass, Ward's Pass, and Blue Lake before returning via the Pilot Ridge Trail. The photo below was taken from the PCT looking south. Trail on the left takes you to White Pass. Trail on the right takes you to Red Pass.
Day one I remember was short and wet. We had started late and just went as far as the Mackinaw Shelter just a few miles into the trail. That's not our stuff in the shelter. I'm too worried about hantavirus to stay in there.
By day two the weather was gone and we had blue skies the rest of the trip. On that day we climbed up to the PCT. From the junction we headed west to Red Pass and explored the basin to the north. The we headed back the other direction past the junction and stayed the night at White Pass.
Day three was probably one of my most favorite days of hiking ever. We took the PCT south then headed up over Ward's Pass which has amazing views of Glacier Peak. From there we took the Blue Lake high route. It was sketchy but we made it. The panorama is from the top of the high route looking east to south to west. Blue Lake is down in the bowl to the right.
On the last day we got up before dawn and climbed by headlamp up to Pilot Ridge hoping to get some sunrise photos. It was another great day and we saw no one from camp to car.