You can go do the message board at the couples website and do a search for a maps of couples sans souci. Try using the key words "CSS map" and make sure you change from "or" to "and" in the drop down box. Look for a post titled CSS map.
CSS is situate on a cliff. A and B block are at the bottom directly in front of the beach. As you go higher on the cliff you go further in the alphabet. In G block you are at the highest, and while you have a nice view, you will have to go up lots of stairs to get from the beach, restaurants, etc to your room.
The beachfront jacuzzi suite seem to have nice views from the research I have done. They are also convenient to the beach, restaurants, and water sports.
Hope this helps. I am going in December and staying in beachfront jacuzzi suite thanks to the Fall in Love again special. The beachfront jacuzzi suite is the second highest room category at the resort, but just for the fall, the special makes it cheaper than the lowest category. It is a great deal.
You should check out couples message board if you are interested in more information. Recently there have been several posts with pictures of beachfront jacuzzi suites.
~stray_chicken