Go to Yosemite Park, drive to Tuolumne Meadows, find Cathedral Peak trailhead. It's 3.5 miles to Upper Cathedral Lake
Living and working at sea level makes life tricky in the high country. Even though this was my second day of backpacking at the Cathedral Lakes, and should have been somewhat acclimated to the altitude, my unaccustomed lungs were still sucking wind as I clambered around the bluffs above Upper Cathedral Lake shooting the incredible alpenglow that glazed Cathedral Peak. The bright orange light on the peak and in the sky was due in no small part to a wildfire raging down near Yosemite Valley.