I would avoid fruit which has natural sugar and try things like veggies & a sour cream based dip or nacho corn chips and salsa. The dipping keeps adhd boys occupied and interested and you are avoiding sugar. Just my experience!

But one more thought, adhd boys have already been cooped up in school all day long to concentrate which is against their nature. Don't worry about planning a craft. You may feel you are copping out on being productive but if you present it properly to the parents you are really doing what's best for the boy. Take him outside and let him PLAY!