What were the prices like in the restaurants for breakfast/dinner? Does the 15% off make a big difference? Did you have to show your card or just bill to your room and then everything is adjusted at checkout?
The waitstaff asks for your room number when you sit down at the table.
Just looked at my bill we spent $250 on food and drink (pre-tax & tip) for a three night stay. Alcohol with every lunch and dinner and also from the poolside bar as well.