Like this?
I agree with Russ that it will be an exercise in B&W/graphical rendering. To Peter's point, I think straight conversion will appear a bit 'murky'. Try leaving your shadows close to where they are, but increasing the 'whites' until the water is almost without detail. I hope you don't mind a quick example,
bearing in mind that a) what you and I see on screen may be different, b) the rendering is
your artistic choice, and c) any rendering should take into account the medium and presentation (matted and framed print?)
