The commercial certificated pilot was landing at his private airstrip, located on an island, at the conclusion of a Title 14, CFR Part 91 local area personal flight. During a telephone conversation with the pilot on June 18, 2007, he reported that during the final portion of the landing approach toward the northeast, the airplane encountered severe turbulence. The pilot said the airplane was pushed to the right of the landing area, and collided with trees. The landing area was about 1,800 feet long, and about 30 feet wide. The south side of the island has several peaks along a mountain ridge that vary from about 1,200 feet to 1,700 feet in elevation. The airplane received structural damage, and the pilot received minor injuries. In the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1) submitted by the pilot, the pilot indicated that the weather conditions were clear, and the wind was variable at 25 knots with gusts to 30 knots.