THE PLT REPORTED THAT HE INITIALLY FLARED TOO HIGH DURING THE LANDING. HE RECOVERED AND THE ACFT SUBSEQUENTLY TOUCHED DOWN 'FIRMLY' ON THE MAIN GEAR. THE ACFT THEN BEGAN TO VEER TO THE RT 'AS IF THE RT BRAKE WAS LOCKED'. THE PLT ATTEMPTED TO ABORT THE LDG & THE ACFT PANCAKED INTO A DUNE ADJACENT TO THE RWY. A MECHANIC WHO EXAMINED THE AIRPLANE AFTERWARD REPORTED THAT THE PLT STATED TO HIM THAT THE AIRPLANE HAD LANDED HARD. THE MECH REPORTED FINDING THAT THE RT WHEEL AXLE WAS BENT WHICH HAD RESULTED IN THE FWD SIDE OF THE TIRE BEING DISPLACED OTBD. NO EVIDENCE OF BRAKE MALFUNCTION WAS FOUND. ACCORDING TO THE ARPT FACILITY DIRECTORY, THE ARPT HAD NO RWY LIGHTS AND CLOSED 30 MINUTES AFTER SUNSET. LOCAL SUNSET OCCURRED AT 1835, ACCORDING TO THE NWS. THE PLT REPORTED THE TIME OF THE ACCIDENT AT 1930. A SHERIFF'S DEPUTY WHO INVESTIGATED THE ACCIDENT REPORTED THAT IT OCCURRED AT ABOUT 1955.