Movie night with treats. Outdoor bubble party. 

Bubble Recipe

Take a day trip to the zoo. For younger children, put a large box in your living room, let them decorate it and play in it, great for the imagination. Picnic somewhere they have never been before. Plant some spring flowers or a container garden. Bake cookies and take them to Grandma & Grandpa. Go fly a kite! Go feed the ducks at a pond.  You can use stale bread. Go to the public library for reading time.