Fly kites only in safe areas. Never on stairs. There are two reasons for this. It is always a good idea to check with a responsible adult. A blanket can be a tent, sleeping bag, sail for a boat.
Boxes can be pots, pans, lanterns, cameras.
A really big box can be a canoe. Cardboard tubes can be a telescope, binoculars, fishing pole. Make your campsite into a fort or clubhouse. Make the game up as you go along. Parades Summer is the season for parades.