Play kick ball or do a mini agility course. Invite them to bring bikes and helmets, or go for a walk, but always monitor their outdoor activities carefully. If it's raining, pop in an exercise CD or ask one of them to be a gym teacher and laugh together while grandma tries to keep up. Be prepared to cook ahead with simple meals and healthy snacks that they can help you with. Plan where they will rest separately and have enough pillows and bedding. If they can bring sleeping bags, that's even better. If necessary, use sofa cushions or exercise mats on the floor for small children who may roll off the sofa. Store each child's belongings in a laundry basket or box. Include a plastic bag for dirty clothes and another for camping keepsakes. Children, even teenagers, need some down time and so do you. That's when you can give them some limited time in front of the TV or computer. Insert a short video or watch something on You Tube that has to do with the topic of your field. Be aware of the Internet sites they use. Don't just assume, inquire and tell them why. In quiet moments I always tell them “you don't have to sleep, just rest peacefully for a while. Grandma needs to recharge. I set a timer for 30 minutes. They usually cooperate and often fall asleep. Always make sure an adult is still awake and alert. Little ones should nap normally