Thanks everyone for your comments and suggestions.  Here some re-renders, but I
am not happy with any of them yet.  After looking at some photographs of actual
island scenes, I realized the water is neither so reflective nor so transparent.
 Or rater, it *is* reflective, but blurry like one might expect from dull metal.

The first image uses blurred reflection, the second is based on the water
material suggested by Trevor, and the third, well, I included it because it was
there.

Using media in the water multiplied render times by ten--I am wondering if I
could not get a sufficiently similar effect by using a ground fog translated
below the water surface...?

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