While at the Outer Banks, I did some more experimentation with long exposures and the water. This is related to that, 8 seconds at f/16, ISO 50 from the 5D mkII. I enjoyed the results from these, with the motion of the water while leaving the sand and sky untouched.
Next trip will call for even longer, and perhaps somewhere that has more architecture that engages with the water, but I found this quite satisfactory for a first go.