I love the color contrast.
It's amazing. I'm not sure if this was a planned shot, if taking this was just sudden, or if you adjusted the photo in some way or another, but the effects of the similar color schemes, nature's layers, and the lines created by what I've mentioned previous, this photograph is beautiful. The differentiating shape and line work of the dock is probably what draws my eyes back and back to that again-where as everything is else is quite horizontal, the dock is similarly different.
I'm trying to sort out exactly what I like about this photo, but honestly I'm just an amateur photographer. Bottom line is that this is beautiful.