When visiting Estes Park, Colorado, one must-see activity is exploring Rocky Mountain National Park. The park is known for its stunning mountain scenery, diverse wildlife, and extensive network of hiking trails. Highlights include driving along the scenic Trail Ridge Road, hiking to Bear Lake and Emerald Lake, and spotting elk and other wildlife in their natural habitats. Whether you're into hiking, scenic drives, or wildlife photography, Rocky Mountain National Park offers an unforgettable experience.