Set up a tent in the backyard and enjoy. If campfires are not permitted in your area - pretend with flashlights. Have a snack and a campfire sing-along before bed. Bird Watching Go for a walk with kids and see how many different birds you can spot. You can bring a notebook and write down the ones you see - if you don't know what they are describe them and then go to a library and track down what you saw.
Bird books are also available at most book stores.
Mud painting Have kids dig up a good pile of dirt and give them a hose to make dirt. Then transport the mud to the driveway. Allow kids to use old paintbrushes to paint with the mud. They will have just as much fun cleaning it up with the hose. Old washable clothes advised.