Fun with the kids
Rainbow Loom -- lots of ideas for different types of bracelets!
Outlines of famous works of art for kids to color
DIY Animal Silhouette tutorial
Kids Outdoor Scavenger Hunt - for Case's Birthday?
How to keep a child busy for hours in the summer: DIY: Giant Ice Cube Awesomeness - filled with plastic animals, dinos, and such.
Marble Races with a cheap pool noodle (occupies the kids for hours.) Great for rainy or hot summer days! Very cool idea!
Catapult built from popsicle sticks, rubber bands, and a bottle cap.