The pilot was landing on a remote airstrip next to a lodge. The airstrip's gravel bar, and sand bar surface, were uneven and soft. During the landing roll, the airplane encountered an uneven area of the gravel bar, and bounced into an area of soft sand. The tip of the left main wheel ski assembly dug into the ground, and the airplane then nosed over. The airplane received damage to the main landing gear, fuselage, and wings.