On a brief visit with my brother in Jackson Hole, Wyoming, we hiked up to Amphitheater Lake in the Teton range. It was gorgeous! It was kind of a strenuous hike (especially if you're coming from sea level like I did), but well worth the climb. The views and alpine lakes at the top are stunning. I'm sure there are lots of other comparable hikes in the area, but I didn't get a chance to check them out. Next time!