Hi-Liner Dual Racing Zip Lines, Plymouth

When it comes to choosing a location synonymous with adrenalin, Hi-Liner Dual Racing Zip Lines couldn't have picked a better spot. Road America, Hi-Liner's home, plays host to high-octane NASCAR races, the Ferrari Challenge, and the AMA Pro Racing Superbike Doubleheader. And while zipliners don't quite reach the speeds of the vintage Ford Mustangs that often race at the track, they've been known to blow past the 50 mph mark along the 1,200-foot course—all while taking in views that pro racing couldn't hold a candle to.