Very nice Dave! I think the composition is perfect, you have some waves coming in, you have the person bracing against the water or perhaps he is wake boarding, but either way the angle of his body flows perfectly with the incoming water. The sun has been handled well, the clouds are bridging nicely across the scene. And I actually like the seaweed. Shooting at the beach as often as I do, I have found that seaweed can look cool in person, but usually translates to a distraction when included in a photograph, but not in your scene. With it being in the corner like it is, the seaweed helps to mask the footprints along the beach.
So I give this an A+