This word building activity travel kit is perfect for preschoolers for road trips and long car rides and you can customize it with sight words, color words, word families, or whatever your child is currently learning. Great for a summer learning activity.
Balloon Rockets - I've done this in several science camps I've conducted. Kids have fun with it. But, when the balloon deflates it may fall off the straw because it's surface area changes - another good thing to show and explain to kids.