The Lakes Trail in Sequoia National Park offers amazing views of three amazing alpine lakes: Heather, Emerald and Pear Lakes. The trail is popular for day-hiking, but I would always recommend an overnight trip whenever possible.
An Eastern Sierra Epic Lake Adventure: Big Pine Lakes
The hike to Big Pine Lakes is a challenging 15.2-mile out-and-back trail located in the John Muir Wilderness in the Eastern Sierra mountains of California.