To make the body produce adrenaline, people usually must kick a cop in the chin, juggle soldering irons, or trap wild animals underneath wet newspaper. Today's Groupon gives you a more comfortable way to excite your cellular infrastructure: for $39, you get a two-hour zipline tour at Mount Hermon Redwood Canopy Tours (an $80 value). Tours are available Tuesday through Sunday during the spring, summer, and fall, with reduced operation in the winter. Hours and times vary, but information is updated online.

Once you and seven fellow wilderness wanderers strap on helmets, harnesses, and gloves, you'll head over to Bean Creek Canyon—a pristine redwood preserve nestled among the Santa Cruz mountains—and spend two hours soaring between the boughs of some of the world's tallest trees on six ziplines up to 440 feet long, along with two sky bridges that take you 150 feet above the Ewok-infested forest floor. Though you'll feel the wind of trunks and branches as they rush past, seemingly within inches of you on either side, you'll reach the next platform without bruising so much as an ego. In between lighting off bursts of adrenaline fireworks, Mount Hermon Redwood Canopy Tours' two certified tour guides will share ecological facts, bringing the majestic centuries-old trees alive in a way that doesn't involve them angrily pelting you with apples.

Mount Hermon has existed a tree-like 104 years by making safety, stewardship, and sustainability its top priorities. Bonsai Design built the zipline course to adhere to national standards developed by the Association for Challenge Course Technology. Only top-quality cables and hardware are used, and Mount Hermon gives the course daily visual checks and annual inspections. All platforms and bridges are made from sustainably harvested redwood lumber, and zip corridors are arranged so as not to impede the great arboreal giants' growth, allowing them to one day welcome friendly space owls to earth with their interstellar branches. Reservations are required, so call ahead or go online to reserve and please arrive 20 minutes early.

All participants must weigh between 75 and 250 pounds, stand over 52 inches in height, and be in good physical condition. Not recommended for children under 10 years old.

Reviews

Yelpers give Mount Hermon Redwood Canopy Tours a five-star average, and four TripAdvisors give it a 4.5-star average:

• From the great history lessons of the region to the many platforms that zip your [sic] through the forest, your adrenaline will certainly be flowing. – doug v., Yelp
• Canopy ecology/beauty and local history are intermixed with fun and thrills. The trip of a lifetime is no exaggeration. – kmbmitts, TripAdvisor