RedactedNarrative: V1 WAS BACKING OUT OF A SLIP AT KAHUNA BAY WHEN THE OPERATOR SHIFTED V1 INTO DRIVE AT FULL THROTTLE WHILE TURNING LEFT AND STRUCK A JET SKI DOCK CAUSING DAMAGE TO THE DOCK.  WHEN V1 STRUCK THE DOCK, V1'S MOMENTUM CAUSED THE STERN TO SWING INTO V2 WHICH WAS PARKED IN A FUELING SLIP AT THE END OF THE DOCK.  V1 SUSTAINED DAMAGE TO HALF OF THE STARBOARD SIDE PONTOON. V2 SUSTAINED DAMAGE TO THE UPPER AND LOWER ENGINE COWLING.  DOCK DAMAGE: PLASTIC FLOATING MODULES DAMAGED AND THE STEEL BRACKETS WERE BROKEN.