After returning from a parachute jumping flight, the pilot elected to land on the 1800 ft grass runway. A 3000 ft asphalt runway was available, but he had been using the grass runway to avoid wear on the tires. There was a 30 ft powerline at the approach end of the grass runway and the sod was wet. The pilot reported that there was light rain and the wind was calm. Reportedly, the plane touched down about 200 ft from the approach end, but the pilot was unable to stop on the runway. The aircraft continued off the end and collided with brush and trees. The computed landing distance over a 50 ft obstacle on a hard runway was about 1500 ft.