Ziplining pioneers Buck and Danny Boren founded Skyline Eco-Adventures in 2002 to both share and sustain the natural beauty of the Hawaiian Islands. The father-son team built their first zipline course minutes from Haleakala National Park, providing stunning canopy views of the forest without the ecological impact of leading vehicle-based tours or installing a series of escalators. They strung lines over fragrant eucalyptus groves and even constructed a treetop rope bridge. Of particular note: the up-and-back "pendulum line," which reaches speeds of up to 45 mph.

From there, they went island-hopping. Skyline Akaka Falls zips above a 250-foot waterfall, while Skyline Kauai shows off the seascapes and beaches of the southern shore. As they've expanded, the duo have increased the amount they invest into preservation. They donate 1% of all proceeds to environmental-preservation efforts, and have made all tours and services they offer completely carbon-neutral, which means they've figured out how to avoid consuming fossil fuels better and hold their breath longer.

Skyline's suite of tours is designed for zipliners of all ages and experience levels and was named the #1 Land Activity/Adventure Tour Company in Hawaii by TripAdvisor, as well as winning their TripAdvisor Hall of Fame Excellence award.