Stick to the same meal and snack schedule as during the school year. Kids are less likely to eat constantly when they follow a regular routine.
Keep a variety of low-fat, high-fiber treats around, like fresh fruit, to encourage kids to pick healthy foods.
Get your child outside to play tag, climb trees -- anything that gets him moving instead of vegging.
Enroll him in a class or activity he likes to put some structure into the week. Even better: Find something fun you can do together.