Toddlers like goop. Mix cornstarch and water together. Let toddlers play with it in a bucket or in bowls with cups and spoons. Make the goop thick or thin. Cut doors and windows in the box to make a playhouse.
Toddlers like to draw with short, fat, unwrapped crayons.
Let toddlers tear old wrapping paper. Then have them paste the pieces to make a collage. Have toddlers finger paint with shaving cream mixed with food coloring. They like this mess. Toddlers like to jump.