Ziplines originally were invented for just two functions: sneaking hamburgers over the Berlin Wall and zazzing up presidential entrances to State of the Union addresses. Soar through aerodynamic history with today’s Groupon: for $50, you get a zipline tour from Lake Travis Zipline Adventures in Volente (an $89 value).

Hurtling through the air at upwards of 50 mph, guests to Lake Travis Zipline Adventures fly over gleaming cerulean waters while strapped into the longest zipline in Texas. After a quick boat ride to the starting locale, experienced guides lead guests through a comprehensive orientation, explaining the safety gear and proper body positioning. Guests hike to each of the five airborne trails, strapping themselves into a harness and helmet before stepping off the platform and into the air, tearing through the sky like the enjoyable version of a tightrope walker’s recurring nightmare. The grand finale towers an exhilarating 20 stories over the lake, a half-mile stretch of taut cable that supports zooming guests as they reach speeds of 45–50 mph. Once the coursing adrenaline slows to a patient throb, guests can rest and picnic on the pristine shores of Lake Travis Zipline Adventures’ private beach, complete with swimmable waters, relaxing hammocks, and circus routines performed by flying fish.