I've often dreamed of a place like this. I know there must be tons of places such as this one but I get a weird sense of deja vue looking at it.
The image is pretty good... it is slightly underexposed, by a stop or more but I still get what you were shooting and if this was intentional, it's not bad.
I don't see the dramatic underexposure really doing this image much justice. If the subject is the low tide, I would expect that to draw me in, but naturally the large body of water is the brightest and most colorful subject here, leading the eye there mostly.