The only place where there is shade to sit down is around the restaurant. All the lounge chairs we saw were on the beach and in full sun. IMO, the cabana made the special day even more so. The hostess came by several times during the day to see if we needed anything. She replaced any drinks or snacks we consumed. We know she had been by to check on us when we weren't there because she kept the deck swept and brought us fresh towels without us asking. We did not ask about lunch at the cabana but I doubt they do that since the restaurant is counter service.
Here is a pic of the map they give you that I will be posting in my TR.
Our cabana was Starfish 01. It was the first cabana just to the right (in the picture) of the Starfish dolphin pool there in the center. I'm not sure where the other cabanas were located but ours was perfect! Have fun!