Marble Races with a cheap pool noodle (boys would be occupied for hours.)
Awesome site...lets you upload any pic and convert to a coloring page. Make coloring books for kids. Hilarious!
Roll of tine foil, water and little boats
50 Things To Do On Your Trampoline Repin now, read later
Koolaid slurpees, better than 7/11 - want to try this in the summer
Pendulum Painting - Martha Stewart Kids' Crafts
Come Together Kids: Mini Marshmallow Shooters (or Pom Pom Poppers)
[how to make] Sidewalk "chalk" spray! washable tempera paint - 1 cup of hot water - cup of cornstarch - Squirt of dishwashing liquid - 1 squirt bottle
Trampoline Tent!! Great for summertime sleepovers!
minecraft themed cake.