At approximately 1200 hours on 12/2/12, v1 was traveling southbound at naples bay marker 25.  V1 encountered an oncoming wake from an unknown vessel heading northbound.  V1 traveled over the first wake and came down hard on top of the second wake.  Passenger was sitting on the port side forward cushion and complained of back pain immediately after hitting the second wake.  Operator stated the wake was approximately 2' high and he was traveling at approximately 28 mph.  Victim then laid down flat on her back and operator turned the vessel around and headed back to the dock.; xrays revealed no damage or injury, treated for back pain
NAPLES                        