One of the most exciting subjects to learn, and to teach, is art. Typically, kids really enjoy the opportunity to be creative in the ways that art allows. The freedom of expression and the ability to have the chance to make something really opens the door of artistic interpretation. It may for those reasons that children really love the time they spend creating.
Art doesn’t have to be a difficult subject to teach. If you are working on being creative, the point of the activity should just making something original. If you are interested in approaching the subject from a more academic standpoint, then finding an art curriculum you enjoy teaching and one they enjoying learning is the best way to get started.