The sun and altitude provide a mix that makes the town one of the best places for an endurance athlete, particularly cyclists and hikers. Start at Amante Coffee (amantecoffee.com) on North Broadway, where the cyclists hang out, then ride 14 miles up through Lefthand Canyon to Jamestown, an old mining outpost. You can also take joyrides in the Valmont Bike Park (valmontbikepark.org), and cross-country ski around North Boulder Park. Great hikes and walks around town: Chautauqua Park, Mount Sanitas, or the Boulder Creek Path.
Where the athletes eat: Snooze ($; 303/225-7344) updates its pancake menu seasonally. Carbo-load on scones at Spruce Confections ($; 303/449-6773).