Thailand is my favourite place for street food.
Breakfast: Pineapple and Melon from the hawkers with the hand cart full of ice. Or the fresh fruit smoothies/ice shakes they make for you.
Desert: Banana pancakes with sweet milk.
Yum.
I feel sorry for all the people who are too timid to eat at the street stalls. If it looks OK, it's cooked in front of you, steaming hot and other people are eating it then it's probably fine!