Flattop Mountain is an excellent introduction to Rocky Mountain National Park. The 8.8 mile out and back trail passes a bit of everything including alpine lakes, forest, treeline, and tundra. The trail starts at the Bear Lake Trailhead at 9475 and ascends to the top of Flattop Mountain at 12,324 feet. Go early as I visited on a Monday in late October and the parking lot was almost full. Enjoy this photo essay.
Bear Lake from the ascent.