Eldorado Canyon State Park preserves a truly golden section of the Rocky Mountain Foothills near Boulder, Colorado. Its pointed cliffs framing South Boulder Creek are a playground for climbers. Hikers have a lot to enjoy as well, like Rattlesnake Gulch Trail, which is scenic and attraction-packed, covering 3.8 miles on a lollipop loop. The hike takes a moderate route up the side of Eldorado Canyon to the Crags Hotel Site, the fading ruins of a more-than-century old resort. ...Read more.