On our last cruise we went back to the ship to eat, thinking that we would have the same food choices as Castaway Cay. We were a little surpised to see that only Parrot Cay was open for lunch, and their buffet was MOSTLY cold item (lunch meats and salads...) There was a specialty make-it-while you-watch pasta station, which was excellent, and there were also a zillion different desserts. All-in-all, it was pretty good.
But--be forewarned....if you're looking for that famous BBQ food on the ship while at CC, you won't find it!
Also--if you want some down-time, go to this buffet on the ship. The place was almost deserted so we practically had the whole wait staff to ourselves!