Environment

i have a trouble with my sh4 environment now - water too transparent, or to transparent underwater. How i can resolve this problem, what parameter in what file i have to change? I have a experience with S3D editor. And another one important question: how to get clouds reflections on water? Please, any knowledge will be awesome.

Another question, how to make sun disc bigger, when you look at it through clouds it too small, not as an real life.