Colchuck Lake is one of my favorite hikes in Washington State! On a sunny day the lake is vibrantly aquamarine blue and on an overcast day it is just as beautiful with the contrast of the dramatic Dragontail Peak and Aasgard Pass in the background. The hike is off Icicle Creek in the Stuart Lake Trailhead parking lot, so it takes about 2.5 hrs to get there from Seattle, but worth the trip. It is an 8 mile hike round trip, and the incline is very manageable.