IF you can get nutritional info, that'd be great. Then you'll know how many calories, etc. that are actaully in the food! Other wise, yeah I agree - eat a salad every day. When I was eating at the cafeteria on my campus it was buffet style and really hard to portion control, so good luck with that!
Maybe try counting food types and portions, setting a number each time. For example, say you're going to have 2 grains, 1 piece of fruit, and 1 dairy..
Or before you go, plan out what you're going to eat so you're not tempted to just eat anything that looks good. good luck