RedactedNarrative: V-1 was traveling north in St Joseph Sound on the east side of Honeymoon Island State Park.  V-1 was traveling in shallow waters and in a posted "no internal combustion motors" zone.  V-1 operator estimated speed between 10-20 mph.  V-1 turned left unexpectedly and went into mangroves at Honeymoon Island State Park.  V-1's bow was approximately 45' into the mangroves V-1 operator was not ejected, but sustained a cut to his lip.  V-1 occupant 1 was ejected from V-1 and sustained contusion and laceration injuries.