Music
According to an Frontiers in Neuroscience article published by National Institute of Health, exposing musical training to younger students can offer substantial cognitive development.
I can provide basic to intermediate level lessons on both the piano and the guitar. My goal is for students to become self-proficient to the point where they can develop their musical abilities on their own. If they choose to advance in the field, then I can recommend other professionals who specialize in music theory and performance.