Late this afternoon, or just after sunset, when everyone's tired from the day's swimming, playing, eating and all those other summer activities, find a grassy treeless area. Spread out a blanket -- make sure the kids have their bug spray on -- and just lay down (how's that for relaxing?). Watch the clouds if it's daytime, and see what shapes you and your children can see. Let them tell you stories about what's going on with the clouds as they change, or make some up yourself. If your kids are old enough to stay up till dark, have a stargazing night: Watch and wait for the first star (make a wish!), and then look for the constellations. We bet you can probably find the Big Dipper, but to help you identify others, we suggest a copy of Find the Constellations by H.A. Rey (the fellow who created Curious George).