Ziplining is an exhilarating way to enjoy aerial views of nature without sucking on a helium tank until you get really big and drift away. Float above treetops with this Groupon.

$32 for Three Hours of Aerial Ropes and Ziplining ($69 Value)

During a 20-minute orientation, guides introduce visitors to their harnesses, helmets, and other gear. They teach them how to use this equipment on the course, and then set participants loose on the first beginner-level course. The guides judge visitors' abilities before letting them move on to more challenging territory.

All visitors have a three-hour time limit to complete as much as they are able. The seven courses include more than 10 ziplines and rope obstacles such as swinging log bridges, hanging cargo nets, and monkey swings.

Treetop Trekking by Arbraska

Chirping birds and the wind in the trees are the only sounds that break the silence in Muskoka Forest. Until a human flies screaming through the canopy, that is. Treetop Trekking by Arbraska's seven aerial-rope courses wind through the forest canopies, challenging visitors with levels of difficulty increasing from beginner to advanced. Guides begin each adventure with a brief equipment-and-technique orientation, and gradually clear visitors for more difficult runs based on their performance.

Once they're cleared for climbing, participants scramble across bridges made of swinging, suspended logs. They crawl across webs of cargo netting, and swing through monkey cables. A series of ziplines completes each course. Guides help adventure-seekers navigate these treetop courses during regular day tours, or during more challenging night climbs, during which participants have only a headlamp and a guide to asking owls for directions.