Wheel Fun Rentals, Denver

Though Wheel Fun Rentals bicycle stables are scattered from sea to shining sea across the North American continent, the seeds of the enterprise were sown in Italy. On vacation in the late '80s, founder Brian McInerney discovered the four-wheeled Surrey cycle, a pedal-powered vehicle capable of carrying as many as six passengers. Before returning to the States, he made sure to pick up a full set of Surreys from the manufacturer, and a new chapter in his life began. Today, the business rents not only bikes and Surreys, but also multiple cycle-style mutants such as the three-wheeled Deuce Coupe and its cousin the Chopper. They even carry more advanced land vehicles such as electric cars and scooters. Kayaks, one-person pontoons, and stand-up paddle boards also unlock access to some of the country's wettest byways.