The emergency ditching procedures section of the POH for my Cardinal RG calls for transmitting a mayday (with your position), securing or jettisoning heavy objects, keeping the landing gear up, setting the flaps at 30 degrees, using power to establish a 300 fpm descent at 60 knots (if power's not available, 10 degrees of flaps at 65 knots). If the winds are high and the seas heavy, the approach should be made into the wind; if the winds are light with heavy swells, the approach is parallel to the swells. The doors should be unlatched and contact with the surface should be in a level attitude at a 300 fpm descent. The POH advises cushioning your face with a folded coat or seat cushion. After the airplane comes to rest evacuation is made through the cabin doors. If necessary, the vent windows can be opened to flood the cabin to equalize pressure so the doors can be opened more easily. It may be necessary to use your feet to force the doors open.