Beautiful location, but be aware of the horizon. Not a single shot is level.
#1 and #3 - I have the same critique for these two. In beach shots like this, it's usually a good idea to have something else in the frame to give some interest. Since there's really nothing except sand, water and sky, they look sorta boring.
#2 - I like this shot except for one thing. The garbage can right in the front of the image. It really distracts. There's enough interest on that little island or outcropping that the photo could probably stand on it's own without anything extra in frame.
#4 - This critique is sort of a combination of the last two. The garbage cans and the guard rail are distracting, and there's not much else to hold interest. Maybe if you'd been able to shoot from that rock ledge, or just back from it, and had something in the foreground, it would have been a better shot.
#5 - I like this shot the best. There's foreground interest, and even though there's a garbage can, it's mixed in with the rest of the foreground and doesn't distract from the overall image. If I had to nitpick (and nitpicking is a curse of mine, lol) it would have been nice if you had aimed the camera a bit more to the left to include more of that palm tree and give a more pleasing composition.
I'm not trying to be mean or anything. I'm sure you had a great time on vacation. I am just critiquing your photos to help you improve later. These photos will for sure be excellent memories for you in the future. Good job.