Read! Go to the Public Library and you'll be amazed at what you find. .Borrow audiobooks for car trips.
Exercise! Play games with friends. Practice cooperation, winning and losing.
Do something to help others. Everyone needs a favor and those skills transfer to real life work.
Make yourself do something you thought you didn't like or couldn't do. Write letters. Keep up with the local, national and international news. Plant a garden and make scientific observations. Make a chart, graph or sketch.