Stock photography, photos: A couple hiking on a trail Stock photos of A couple hiking on a trail at Sierra Buttes, CA. Photograph: © William Stevenson Click for a larger image and more information Keywords associated with this stock photo: Backpacking, backpack, backpacker, Wilderness, high country, back country, simplicity, inspiration, action, active, effort, energy, aerobic, challenge, desire, adventure, freedom, hiking, distance, vista, grandeur, vastness, beauty, couples, morning, evening, man, male, female, trail, sign, woman, sierra, mountains, summer, lake, California, sierras, alpine, water, vertical, kelty, thermarest, Mcna Pres, outdoors, outdoorsman