The pilot reported that he attempted to land the float-equipped airplane on a lake with “glassy water” conditions. He made an approach to the lake where he could use the shoreline as a reference, and where some ripples on the surface of the lake made it possible for him to attempt a normal water landing. He reported that he “apparently” flew over the ripples. The nose of the right float hit the water first and the airplane started to porpoise. He pulled the nose up and added power to perform a go-around. The airplane was approaching the shoreline so he cut the power. The airplane landed on the water and slid up the embankment with both wings impacting trees causing substantial damage to the airplane.