The float-equipped airplane was observed striking its right wing on water 3 miles west of Juneau, Alaska, while landing, then taking off again. One hour later, witnesses at a lake 30 miles south of Juneau, observed the airplane land, drag a wing and strike the propeller on the water, then take off. The private pilot reported that while in cruise, after the second takeoff, the engine stopped, and he made a power-off landing to the water. Postaccident inspection revealed substantial damage to the right wing.