As the distant sound of chattering-duck calls grows nearer, visitors to downtown Austin know that the colorfully painted Duck Adventure amphibious vehicles aren’t far behind. On board, knowledgeable guides regale sightseers with facts and stories about local sights and landmarks, pointing out the State Capitol, detailing the history of Sixth Street, and addressing all of the parking meters by their first name. After their land trek, the vehicles pack in their wheels and launch off the shores of Lady Bird Lake for an aquatic tour of the lush, scenic lakeside.