Just to clarify my comment regarding lighting - Shooting during sunrise or sunset brings more color into the situation. Be it from the color in the sky or a nice gold sun light lighting up the scene... it just makes for magic by bringing in color and depth to the many facets of the scene. The other was heavy overcasts days (even rain); it gets rid of the bright white in the water and eliminates shadows (as you stated), but also seems to enhance the colors of the surrounding vegetation. Overcast days just makes getting the correct exposure much easier.
Pat