There's no shortage of ways to spend some serious cash in Miami. You could charter a yacht, rent a Lamborghini, or order bottle service at an exclusive club. But if it's a thrill you seek, nothing compares to zooming 40 feet above Biscayne Bay with Miami Flyboard. For $129, you get a half-hour on a Flyboard that mounts to your feet and shoots water out below, lifting you high above the bay. Get a full hour for $229. Learning to fly is easy, the company says, and you should get the hang of it in no time. Then maybe you'll be ready to move on to the Hoverboard, which uses the same setup as the Flyboard and goes for the same price but more closely resembles wakeboarding, snowboarding, or Marty McFly's hoverboard — except this one glides over water.