How many major cities can offer a stroll in the tundra, 12,840 feet above sea level? Only one. High on Mount Evans, Summit Lake is the jewel of Denver's century-old mountain-park system, offering spectacular views to photographers and a highly manageable trail for youngsters and elders. Summer this high in the Rockies is all too brief, but that's all the more reason to enjoy the drive (the U.S. Forest Service charges a fee for access) and the brilliant wildflowers.