For those looking to fill up on Western food, try the Sailing Day Buffet near the SS Columbia in American Waterfront. This is the only all-you-can-eat restaurant at DisneySea, and features classic buffet staples such as salads, main dishes, a meat carving station, and desserts. All you can drink hot or cold tea or coffee is included in the price of the meal, but other beverages, including alcohol, are also for sale.
The dishes tend to be average quality such as you might expect in a buffet, and the price is a bit high, so try the Sailing Day Buffet when you are hungry and ready for a big meal. The restaurant seats 440 and there is priority seating, similar to the FastPass option for attractions, so if you want to eat here, it is good to make reservations in advance.