Lake Serene is in a small basin at the foot of the three rocky peaks of Mount Index. It’s a 7.2 mile round trip hike and 2,000 feet of elevation gain, with most of the gain in the last 1.5 miles just before the lake. It’s a popular hike since it’s easily accessible from the Seattle area and the trailhead is barely a half mile off Highway 2, just a couple of miles before the hamlet of Index. It’s a beautiful place for a picnic and while the water is ice cold, it doesn’t prevent many of the hikers from plunging in. A hazy sky obscures some of the detail of the north facing peaks. The North Peak of Index is on the right skyline. I climbed the North Peak and bivouaced on the summit in 1968.