Climbing in the great outdoors carries certain risks, including bad weather, incessant bugs, and wayward boomerangs. Scale indoor surfaces safely with today's Groupon: for $7, you get a day pass and shoe rental at The Spot Bouldering Gym (up to a $15 value) in Boulder.

A plethora of mock-rock climbing challenges populates The Spot Bouldering Gym with 10,000 square feet of vertical obstacles. Rock climbers can spend all day scaling man-made mountains up to 18 feet high, gripping massive boulders made in the image of Hueco, Fontainebleau, and Abraham Lincoln's nose. Other trials include the gravity-fighting 25-foot roped wall, an assortment of muscle-mightying training equipment, and cushy flooring for seamless dismounts. No experience is necessary to tackle the upright obstacles at The Spot; the congenial crew eagerly shares climbing tips and creates encouraging victory pyramids.