Physicists estimate that 47% of the energy in the universe is stored in stars, and the other 98% rages inside human children. Release your child's unyielding cosmic energy with today's Groupon: for $40, you get a 10-visit pass to Peekaboo Playland in Eagle Rock (up to a $90 value). Open play is held Monday through Friday from 10 a.m. to 6 p.m., and parents are welcome for no charge.

Peekaboo Playland allows children to exercise their bodies and employ their imaginations as they explore a 3,300-square-foot, climate-controlled indoor playground. Recommended for children from infancy to 8 years old, the playground consists of air-filled bounce structures, a tube slide, an inflatable vehicle-licensing-registration center, and a ball pit for hours of fun play. Kiddies can listen to the sounds of ocean waves and tropical birds as they play with games, puzzles, arts and crafts, and musical toys in the cushioned reading corner of Boo’s Beach Shack before making their way over to the retro café play set to reenact their favorite episodes of Alice. A dress-up nook invites tykes to delve into a wooden chest full of creative costumes and stand in front of mirrors to get dressed up and pose in anticipation of a stylish play date.

Lined with large windows that welcome in natural light and padded with grass- and wood-like floors, Peekaboo also displays a wealth of colorful, child-friendly paintings to fuel creative daydreams. Caregivers can keep watch over their little ones as they take advantage of complimentary WiFi and coffee, and Peekaboo Playland also welcomes in outside food, allowing parents to pick up lunch on the way in or place an order for pizza during a practical game of telephone.