Located in Yosemite Valley, Mirror Lake is famous for its reflections of Half Dome and Mount Watkins when the water level is high enough; to be fair, it's more of a pond than a lake. But it's a pretty pond that can be accessed by an easy two-mile round trip stroll from the valley floor.
If photographs are what you're looking to capture, be sure to visit in the spring and early summer; birders will enjoy catching glimpses of white-headed woodpeckers and martens. If you’d prefer a circumferential view of the lake, there’s a five-mile (eight kilometer) loop hike that is sure to satisfy.
The Mirror Lake Trailhead is located at shuttle stop #17; a paved trail will take you directly to the lake. To access the loop, take a right at the stone bridge. Visit on a calm day in spring or summer for the best reflections of Half Dome and Mount Watkins.