Anyone who had fun as a kid splashing around in puddles will love these “jet-powered” water toys. (Courtesy of Kawasaki) Bring Friends Kawasaki Jet Ski Ultra 310X $18,299 You’ll need to hang on tight to the Ultra 310X—powered by a 310-horsepower supercharged, fuel-injected, four-cylinder engine, it has a top speed of 67 miles per hour….