Visit a farm. Feed the chickens. Ride a horse. Talk to the farmer.
Play with puppies at the pet store or at an animal shelter.
Water fight! Fill balloons and water guns!
Clean out closets and toys. Decide where to donate them and deliver them together.
Host relay races in your backyard. Search for ideas online. Create an idea of your own.
(Taken from: http://www.today.com/parents/21-ways-save-money-have-fun-kids-summer-t30991 )