Eldorado Canyon State Park
Located on the Southern edge of Boulder along the road you’d take if you were going skiing, Eldorado Canyon is one of the most challenging rock climbing destinations in the world. Within the canyon, you’ll find a cozy little town with a few small homes cluttered along the creek and a public swimming pool with a slide, diving board, and a gorgeous mountain backdrop. Non-climbers can get in on the action by walking along the hiking trails at the edge of the canyon, where you can catch people hanging from the rocks high above you—we like the Eldorado Canyon trail for beginners. For a hike with more dramatic views, stop at the Doudy Draw trailhead on the way in and do the Spring Brook Loop, which offers sweeping panoramas of the flatirons and the mesas below them (it’s particularly perfect around sunset).