This was a day hike to Devils Post Pile and Rainbow falls two days before we started our JMT hike. No packs, just water and a lunch. The Devils Post Pile is a unique rock formation of "hexagon basaltic columns" formed when lava flowed into a valley 100,000 years ago and was quickly cooled by a glacier. Rainbow Falls get's it name from the mist at the bottom of the falls that sprays out to form a rainbow. We also walked by a burned out forest area that was started by a lightning strike in 1992. It burned over 8000 acres. The newly opened up portion of the forest has allowed different animals to inhabit the area along with new types of plants.