The private pilot was landing a tailwheel airplane at a 400 foot long, uphill, off-airport site, during a Title 14, Code of Federal Regulations Part 91 flight. The pilot noted that the departure end of the site was adjacent to a 500 foot high ocean bluff cliff. He said that while landing he inadvertently touched down about 100 feet beyond his intended touchdown point. Realizing he would be unable to stop the airplane before reaching the end of the site, he said he applied heavy braking at the end of the landing roll, and the airplane nosed over, sustaining substantial damage to the left wing, left wing lift strut, and empennage. The pilot said there were no preaccident mechanical problems with the airplane, and noted in his report to the NTSB that he should have selected a better area to land on.