THE PILOT WAS VECTORED FOR AN NIGHT NDB CIRCLING APPROACH. HE REPORTED THE WEATHER AS 900 FEET OVERCAST, HEAVY RAIN, MODERATE TURBULENCE AND CROSSWINDS GUSTING TO 20 KNOTS. HE SAW THE RUNWAY, CANCELLED THE IFR CLEARANCE AND INITIATED THE CIRCLING APPROACH. THE AIRPLANE IMPACTED TREES 1/2 MILE FROM THE RUNWAY. THE RUNWAY DID NOT HAVE RUNWAY END IDENTIFICATION LIGHTS OR A VASI.