I would not put pizza hut salad up there as one of the healthiest places to get a salad! I have never eaten there but if you do have to eat there, a salad is the best choice. You can have other ingredients on your salad as well; whats wrong with cucumbers, onions, etc?
As an alternative I would look at maybe making a salad at home and then you know whats in it and whether its safe or not. There must be some alternative places to go!