Just got back from the 4 day cruise. For the first the first three days we had breakfast at Parrot Cay buffet. You go anytime and sit where they take you sometimes by yourself and sometimes with others. You could also go to Tritons where you ordered from the menu and I believe the Beach Blanket buffet was also open.
On the last morning before debarkation, you are scheduled to eat in the dining room that you were assigned to for night one. You either go at like 6:30am if you had early seating or 8:00 am if you had late seating. You sit at your assigned table with your assigned servers. It was a nice way to say goodbye and end the cruise.
Have fun!
