Join Mammoth Lakes Ranger District- Trail Ambassador Brian, on a gathering hike to Heart Lake and make a Cyanotype!   Where: You’ll meet at the Heart Lake parking lot and Trail Head MAP   When: 9 A.M. till midmorning- on Saturday, July 20th, August 24th, and September 28th What: Heart Lake trail is a perfect ~1.5 mile stroll to collect leaves, rocks, flowers and other decorations to use in making a Cyanotype or “Sun-Print”. Logistics: Heart Lake trail is an easy, 1.5 mi trail that gains ~500ft of elevation that starts and finishes at your car.