IMPROPER PLANNING/DECISION BY THE PILOT-IN-COMMAND, AND FAILURE OF THE AIRCREW TO MAINTAIN RUNWAY ALIGNMENT AND CLEARANCE FROM THE HIGH OBSTRUCTIONS (TREES) BESIDE THE RUNWAY. RELATED FACTORS WERE: WEATHER CONDITIONS, DARK NIGHT, LACK OF RUNWAY EDGE LIGHTS, LACK OF VISUAL PERCEPTION BY THE PILOT(S), AND TREES BESIDE THE RUNWAY.