How to keep a child busy for hours in the summer: DIY: Giant Ice Cube Awesomeness - filled with plastic animals, dinos, and such. And I'm sure you could put in food dye before its frozen to color it like the ice block in the photo.
Children have an innate sense of curiosity. Such curiosity leads them to an exploration of the world around them and the natural progression to science. Science Summer Fun Kids Summer fun ideas for kids
Really good for a PEOP lesson or a Science connection :) Alka Seltzer Blob Bottles! - Such a great craft to do with kids! Need: 1 Liter (or any size) bottle, regular water, cooking oil, food coloring, and Alka Seltzer.
30+ Easy Crochet Projects with Free Patterns for Beginners