Note: This is a sort of glitch so it will not work all of the time. It works off your landing. If you land hard enough at the correct angle, the upward buoyant force of the water on the Jet Ski will cause you to do a third Backflip. Go to free roam mode and then highlight either Nigel Carver or Serena Del Mar. Press Z and move the first green dot three slots away from the acceleration side. Then, move the second green dot one slot away from the tight side. Press A and go to Dolphin Park. Once there, go moderately fast (about 105km/h) and hit a double sided jump. Then, do a Double Backflip (follow the Double Backflip hint, but do not hold B ) but keep holding Back. If you are lucky, when you land you will do sort of a bounce and do another flip. Release after your first flip or else you will fall. It is possible to do two extra flips in a row (four flips total).