I've used a long exposure (about two minutes) to "average" the waves to produce a seemingly smooth surface on the water...

Offshore Rock in the Morning Sun

Second Beach, Olympic National Park, Washington Coast

I've used a long exposure (about two minutes) to "average" the waves to produce a seemingly smooth surface on the water.  The white areas are where the waves break and produce the foaming white-water.  As they approach the shore, these waves settle back to regular swells, and hence the color is darker.  These alternative exposures produce a distinctly different image and corresponding different feeling. Photo © copyright by Stephen Penland.