I sometimes used to pick up huge appliance boxes and let the kids attach them to each other. The we moms would go in and cut through them to make mazes..We would also place some eye holes so the kids could look out or we could look in. It was pretty funny to see those little eyeballs or fingers peeking out.. We would then give them flashlights to crawl through there at night..
We also had the kids play
Simon says (we let them call out sometimes and all of the parens would also play as the kids called out the Simon says..
Freeze - the caller turns their back to every one. Everyone walks towards the caller, The caller yells freeze and turns around, anyone still moving is out. The first person to reach the caller wins and gets to call the next game.
Hula hoops, jump ropes, Traffic.. We used to use chalk to make streets with traffic signs, parking spaces on the drive way.. We would park a vehicle on the street across the drive way so the kids did not accidentally ride into the street.
We would build forts with old sheets, swing sets and patio furniture.
Lemonade and bake sale stand..
We found out at Garage sales you can make good money selling lemonade and Pickles.. You know those giant Jars of pickles.. People love those..