My daughter who just turned 7 years old went last year for the first time. I like to tape my hunts, so i made sure she was positioned high enough to see the animals and had a clear view of the camera if she could not see the feeder. Also ear muffs are a must, and bring a gameboy or something or even an ipod. I did all of the above and it was wonderful. Oh and she also had her own binoculars.
Good luck
Jeff