Remember hammering or tying anything to a tree is damaging to the tree and prohibited. For drying wet towels and bathing suits bring along a small collapsible clothes drying rack. A plastic table cloth for the picnic table is a good idea, too. Children get cold faster than adults. The key to comfortable camping is to dress them in several layers, which can be peeled off as they get warm and added on as they cool off.
Kids love flashlights.
Make sure each of yours has one to prevent any arguments. Flashlights are also handy when making trips to the restroom, for making shadow puppets on tent walls and for reading before bed. If there is a family game you like to play at home, bring it along. Playing it outdoors with a lantern or flashlights will add to the fun. Teach your kids to treat the outdoors kindly.