Awesome list of science projects kids can make and eat too. Great list for summer for Preschool, Kindergarten, grade, grade, and grade elementary students. Sounds like a fun cooking class idea
2 cups cornstarch 1 cup lotion or conditioner smooth as silk playdough recipe for kids that smells amazing - two surprising ingredients!
Quiet time activity -- sponge blocks (would be great for kids who don't sleep at naptime) I think that this can be used as a great building tool in addition to blocks. How creative!