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Flip Out
Rug rats bouncing off the walls? Perfect—take 'em to Jump Street, the indoor trampoline park where endless trampolines (more than 100 in the Thornton location) line a giant room—including the walls—for an acrobatic paradise. Don't miss the trampoline-dodgeball area; older kids can sign up for dodgeball leagues. When it's time for a break, head to the inflatable castles or arcade. Don't worry: Special areas for little guys and gals under the age of seven are roped off. 8225 N. Valley Highway, Thornton, 303-426-5867; 10081 W. Bowles Ave., Littleton, 303-339-3030; www.gotjump.com

Climb Time
With a harness and a healthy dose of guts, your little guys can scamper up the 35-foot climbing wall at the Colorado Mountain Club (CMC) in Golden. The two-and-a-half-hour sessions ($11) are fully supervised by CMC staffers who offer tips on skills like belaying and moving smoothly from hold to hold. 710 10th St., Suite 200, Golden, 303-996-2751, www.cmc.org/yep

Kickin' It
Dressed in mini-sized gis—the white, belted, traditional martial arts uniform—four- and six-year-olds scramble to form a line at the start of each Mighty Dragons class at the Boulder Quest Center. They repeat an eight-line student creed about believing in themselves, respecting their teacher, and accomplishing their goals. And then it's playtime. Although the 30-minute class teaches basic self-defense and develops motor skills, the kids never know it as they bounce a giant red ball, leap over hurdles, and tumble over an obstacle course in Karate Kid mode. 1200 Yarmouth Ave., Boulder, 303-440-3647, www.boulderquest.com