I have a son with multiple food allergies and he's going on his end of year field trip, where would be the best and safest place for him to eat ?

Probably safest to bring your own food. Most of the restaurants there just wouldn't be set up to handle your needs.

1.Clean the area your eating at. It's an extremely busy place, they don't have people hovering over tables to clean them as soon as someone gets up. 2.Know your allergies. 3. Bring your auto injector 4. Tell the people making your food, or 5. Bring your own food.