Naupaka Beach Grill has some GF options and they will make accommodations for you. No dedicated fryer though.
Ikenas Landing had decent GF breakfast options and they were fairly accommodating to a celiac teen.
Piko Coffee + Bar was extremely limited. Fruit and yogurt were about the only options.
Granola used in the hotel restaurants is GF but not safe for celiac.
— Very
— Gluten-free items are marked on the main menu
— Some
— Excellent