It varies with each trip for us.
Since we are "local" (2 hour drive) I will bring pantry food and some cold food with me and then make a stop at Publix after check in. I always have drinks and a few snacks on hand in the room.
This last trip we went on we stayed at BLT and didn't go into a park at all. We spent our 4 days by the pool and doing things at the restort we don't normally do since we are usually in a park. PLUS, it's too hot in the summer to be walking in the parks!
We had a simple breakfast (yogurt, cereal and fruit) Sandwiches for lunch, and dinner was Tacos, Grilled Hot Dogs and then one night we went to Cape May.
I always pack a couple extra supplies (dish towels, some better kitchen tools and even a bigger frying pan). Again, since we are driving, this is possible.