Arts and Crafts
Time spent in the creative process is lacking in our society where images are thrust at us in nearly every environment. Our free time is either organized into structured activities, or spent looking at images from electronic devices. All we need to do is gather a few inexpensive items (paper, markers, crayons, glue, tape, blocks), and give our children the free time to get creative. You may need to give them some ideas to get started, but children are naturally creative, and will take off on these activities. All the while, they will be building the visual tools to help them succeed in school.
Incidentally, if you join in on the creativity with your children you can double the fun, inspire your children, guide them into pastimes which will develop better visual skills, and set up an environment, and habit of spending undemanding time with your children.
So get out the paper, scissors, glue, crayons, markers, yarn, sidewalk chalk, paint, felt, ribbon, beads and string, and stretch your imagination.