Thanks for the info. This has such a great balance to it. So much to see and enjoy, yet not too busy. I like the way the boats "anchor" the shot - they set a sort of guard to protect the beach in a way.
How did you get such awesome curvature with the 24-105? Is it due to the full frame of the 5D? You've got the title full of "c"s to which you can add "crystal clear" and "curvature". Great shot for this challenge.