Starts off from the same parking lot as Snow Lake, so it's PACKED. Take the small boot trail to the right just before the main Snow Lake trail starts. Was awesome watching the hoards of hikers take the main route, while we shared the entire Guy Peak trail with 4 climbers working their way down. :0) Amazing views of the surrounding mountains and Rainier as you work your way up. Very steep scramble in areas, with a few challenging rock formations along the way. Crazy high view down from the peak (vertigo definitely kicks in here). Couldn't really run down the trail, as it was steep and rocky. Highly recommended to get away from the masses.