Mexico photos, C&C please...

Went to Mexico last weekend, and took a lot of photos. Here's about 4 or 5 random shots that i'm more pleased with, although I'd like to know where and how to improve. Thanks in advance, JOHN

Last one is really a good photo, it could possibly use a little lightening, and level the horizon.

^^^
Crikeys, i was paying so much attention to the waves, i didn't even notice the horizon

Here's a quick edit of the last photo:

2 and 5 look snapshot like. If your going to post a lot of photos please number them so its easier to give advice.

2 is probably because the subject is centered and we are basically looking at the back of someones head. A crop could help, but it would have been much better if you waited for the surfer to face you.

5 looks tilted to the right, its busy, I'm more interested in whats happening with the people at either end of the picture. Its not making any statement. The boat at the front and the background just aren't interesting. The sky is nearly pure white so I think either white balance is off, or it was overexposed.

The rest are fairly good so no need to comment on them. You could mess with the levels a bit, but I don't think it would make that much difference.