Make an entertaining phone answering-machine message
Stop phone solicitors from calling you by acting like a total wingnut when they call
Put a water slide out your bed room window
Set up the tent in the backyard like it is a campground in the wilderness
Tie ribbons to anything that doesn't move.
Use window markers and draw rainbows on your windows.
Play wacky golf - use strange clubs like a shovel or a baseball bat and strange golf balls too
Make a mini golf game in the backyard
Get a gazpacho recipe or some other kind of strange dish and make it. More food and drink ideas
Make a happiness shrine
Write a postcard to someone even if they are in the same city
Make your own comic book
Get your digital camera and take pictures of crazy items in your house.
Set up a beauty salon day at your house and have your friends bring one beauty tip or you can all change your hair color
Crank up the music and dance in your pajamas
Get a blanket or sheet, and go somewhere you probably won't hurt yourself if you fall. Then have your friend hold one end of the sheet and start spinning so the blanket twists around you, then get your friend to pull his end of the blanket really hard and you should spin around till u run out of sheet.
Have a carpet picnic
Have a limbo contest
Invent a new dance
Listen to classical music, lights off, lying on the floor, and take turns saying what it sounds like
Start a pillow fight
Washable crayons are a wonderful invention. Pick a wall and invite friends
Organize an improvised sports day. Play ping pong on a table with 2 books and a rubber ball. Use plastic bottles as bowling pins. Play basketball or volleyball with a crumpled up piece of paper. Use pens as hockey sticks and a bottle cap as a puck. Or bend wire hangers to make croquet wickets .. and use toilet plungers for the mallets!
.Direct a mini movie starring your friends or members of your family. Write a script (or use your favorite book), make costumes, design sets and props. It doesn't even have to be very long — try making a one-minute movie!
Or assemble an old puzzle and paint your own picture onto the surface. Or cut up magazines and glue a collage onto it. Then separate the pieces (you may need to cut them apart) and see if you can put your puzzle back together again. Or build puzzles online.
Write a letter to someone using only letters cut from newspapers and magazines
Go for a whole day without speaking
Or, collaborate on a story with a friend, each of you taking turns writing the chapters.
Challenge yourself to write a story that's only 100 words long (it's not as easy as you think!)
Illustrate an entire story (maybe your autobiography!) with stick people.
Invent your own board game. Use a board and pieces from an old game you don't use anymore
Host a treasure hunt or scavenger hunt. For younger kids, create a wordless hunt, leaving only pictures (or photos) as clues. One clue will lead to the next, which will lead to the next, and so on. For teens and adults, try some of these ideas.
Engage in an epic waterhose battle (in the yard, not the house). Or how about a shaving cream fight? Or pelt each other with pudding!
Build edible cookie houses with cookie wafers, candy and frosting. Customize them for upcoming holidays. Christmas has gingerbread houses, so why shouldn't Labor Day or Thanksgiving have houses too?
Create a life-sized self portrait. Get a big roll of paper, lie down on it, and get someone to trace around your body
Insert encouraging messages into helium-filled balloons and release them. Be sure to include your email address so people can contact you if they find one!
Go on an alphabet walk. Pick a letter of the alphabet and find as many things as you can that begin with that letter. Or, try to find something that begins with each letter of the alphabet.
Take photos of the letters you see. Or, snap pictures of things that look like letters of the alphabet.