The pilot elected to takeoff on a dark night without runway lights. He stated that the runway lights were not available at the time since the operator was out of town. According to the pilot and other witnesses, at least part of the airport environment was illuminated by the lights near the approach end of runway 23. The pilot reported that he climbed straight ahead to 400 ft AGL after taking off from runway 23. Reportedly at that altitude, he turned right, then back left, intending to land on runway 05. He said that he turned to where he expected to find the runway and began his descent. The landing light was not as bright as he anticipated, the visibility was restricted slightly by haze, and the bright lights of the ball park made it difficult to see. Also, he reported that many of the ball park lights were turned off causing a black area which was disorienting. While descending to runway 05, the plane struck a treetop and came to rest in a wooded area.