2 Best Sights in Rocky Mountain National Park, Colorado

This scenic, calorie-burning hike begins with a moderately level, half-mile journey to Nymph Lake. From here, the trail gets steeper, with a 425-foot elevation gain, as it winds around for 0.6 miles to Dream Lake. The last stretch is the most arduous part of the hike, an almost all-uphill 0.7-mile trek to lovely Emerald Lake, where you can perch on a boulder and enjoy the view. All told, the hike is 3.6 miles, with an elevation gain of 605 feet. Allow two hours or more. Moderate.

The 2.8-mile hike to Mills Lake can be crowded, but the reward is one of the park's prettiest lakes, set against the breathtaking backdrop of Longs Peak, Pagoda Mountain, and the Keyboard of the Winds. There's a modest elevation gain of 750 feet. On the way, about 1 mile in, you pass Alberta Falls, a popular destination in and of itself. The hike travels along Glacier Creek, under the shade of a subalpine forest. Give yourself at least four hours for hiking and lingering. Easy.