We did the Deception Pass loop (start at Hyas Trailhead, head north past the lake, west to Deception Pass, south to Cathedral Pass along PCT section J, and then back east to the Cathedral Pass Trailhead, which is only about 50 feet from Hyas Lake Trailhead)

Left on a Friday afternoon, bypassed the Hyas Lake campsites in favor of adding another mile in. There was only one campsite that we found by Upper Hyas Lake, and it seemed quite large, capable of housing multiple tents. I think we showed up right as a Boy Scout troop was vacating the spot. Nice flat spots with a little creek for fresh (to be filtered) water