I have only visited CN at this point, but I do believe CSA would be a better choice for a true "beach front" room if that is what you are looking for. If you look at a map of the CN property, you will see that the buildings mostly run slightly perpendicular to the beach, and even the ones labeled "beach front" aren't truly beach front. The property itself is on the beach, but if you want to wake up and be only steps from the ocean, CSA is probably the way to go. I will be able to tell you for sure in about 30 days when I visit CSA for the first time.
I haven't noticed a big problem with birds, BUT -- there will be some birds around the eating area.. not a whole lot, but a few, and they are smaller, black birds (I don't know what they are called). Not big like seagulls, if that helps.
Good luck with all of your planning!
Melea & Joseph
CN - '06, '07, '08
CSS and CSA - '09
CSA - '10