Fort Worth Entpa
One of the nation's largest drag-boat-racing competitions, the Ozarka Oklahoma City Nationals pits a string of specially designed top-fuel hydro boats against each other in a series of high-speed quarter-mile drag races. Unlike traditional drag-car racing, boats begin at a crawl before gunning their engines to toupee-toppling speeds of up to 250 miles per hour, nearly half the speed of light. A general-admission ticket grants you a cozy spot along the downtown river's verdant thoroughfare, where you can take photos of the action while remaining relatively still in your lawn chair. Though not included with this Groupon, you can sate seafaring appetites with vittles from the event's on-site vendors.