There are more than a few ways up to Cirque, here are a few suggestions...
NAP...When you top the pass hang a left and stay as close to the edge as you fell comfortable and make your want around on the big slabs.
CP...Go toward Chicken Spring Lake on the PCT. You will climb out of CSL and continue down the trail until the terrain on your right opens up. At that point, angle to high point on the horizon. There is some reasonably easy bouldering at the end.
NAP is easier, CP is more fun.
My guess it's 20-22 miles via NAP and 15-16 via CP.
