Zip lines allow humans to finally experience the life of a bird without forcing them to subsist on breadcrumbs or bathe in a cat's water dish. Spread wingless wings with today's Groupon: for $19, you get a regular zip line ride (a $39 value) at Moaning Cavern Adventure Park in Vallecito.

Moaning Cavern launches adrenaline zealots into a heart-throttling thrill ride along its 1,500-foot zip lines, sending them soaring at speeds eclipsing 40 miles per hour. Strap on the upright zip gear, which secures gravity eschewers into a seated position, before launching off and soaring over the breathtakingly rugged terrain below. The webbed harness also reclines, affording daredevils the ability to hang loose or kick back and enjoy the world's most-fervid catnap. Professional staff closely attend plucky adventurers, whether they're a first-time zipper or a seasoned air diver. When Moaning Cavern's duel zip lines are available, rival siblings can solve dish-washing disputes by racing each other to the finish, and co-workers can finally put an end to long-running disputes over who is more "lemur-like."

Reviews

The Los Angeles Times featured Moaning Cavern Adventure Park. Yelpers give the park an average of four stars, and six TripAdvisors give it an average of 3.5 owl eyes:

• Laughs and shouts the whole way. – Hugo Martín, Los Angeles Times
• Take the fam, get scared, have fun, and enjoy! – Jerry E., Yelp