Not so long ago, jet skiing was a guilty pleasure, thanks to noisy, inefficient engines that dumped gasoline into the water and exhaust into the air. But that was then, and this is Kawasaki’s STX-12F ($8,499), the company’s 30th- anniversary machine, which utilizes the 125-horsepower, 1,200cc engine of Kawasaki’s legendary Ninja ZX-12R motorcycle, and has earned a three-star rating from the California Air Resources Board. (866) 453-8754 or