The air taxi pilot was picking up two passengers from a remote beach site. The flight had been delayed for five days due to bad weather. The accident flight takeoff was attempted during an incoming tide. During the takeoff roll, a wave washed across the beach in front of the airplane. The pilot wrote in his NTSB Pilot/Operator Report that he was 'too slow to fly, and too fast to stop.' He said he rotated the airplane off the ground and applied additional flaps in an attempt to takeoff over the water. The airplane settled, the wheels contacted the water, and the airplane nosed over.