We generally stay at the Polynesian and we love Captain Cooks. If i remember correctly everything that is available for dinner is also available for lunch. We love the flatbreads, grown up grilled cheese and the Aloha pulled pork with poly chips. Delicious!
As far as the dining plan it works like all other CS locations - you get the entree/combo, dessert and drink.
And one of the best parts of captain cooks (in my opinion) is the DOLE WHIP MACHINE!!!!