The 1.4-mile Trading Post Trail at Red Rocks is the perfect length and difficulty — short, easy and at a relatively low altitude — for anyone seeking a nature-y afternoon respite from the bustling streets of Denver. Plus, the gorgeous red rocks and the adrenaline-inducing rattlesnake warning signs are sure to impress out-of-town guests. The trail starts and ends at the Trading Post, where you can grab a snack or make a pit stop before you start hiking. And the hike itself, near the coolest concert venue in the country, is as photogenic as all get-out, so don't forget your camera.