First is my fav, it is obviously stunning. I agree with the edit as far as boat placement, but I prefer more rocks in the foreground.
#2 love it! Nuff said
#4 great colors but I wish for more foreground interest.
#5 I think would be my favorite if it had more room on the bottom, at least to complete that tallest palm tree in the reflection, if not more.
I really like the overall look of these. The colors are all nice and full, but still totally natural looking, and all the images together have a cohesive style, which is a hard thing for me to accomplish.