There are two spots to choose from and they are in the same building. You buy from them and then take your plates to the dining area. There are some great local foods to choose from. Very inexpensive too!! It is right across the street from the park headquarters. There is also a small store there too where you can buy some snacks,soft drinks,water etc...
The food was very good at the Khao Yai Garden Lodge.
Favorite Dish: My favorite dish was a whole fish that I don't remember the name of now.
In the central of The National Park, near visitor centre, there is a big cafeteria with various food (mainly Thai) and great nature surrounding.