Introduce the Japanese language. Many students never learn that other languages employ different alphabets, let alone syllabaries or ideographs. There are a number of useful introductory units on the Japanese language. They train students in proper pronunciation of terms and, more importantly, introduce them to a language that reflects historical realities. But perhaps the biggest reward gained is a demystification of the Japanese language.
Most students have no idea how to even approach the language.
It is difficult to respect or understand a culture that seems to have an entirely meaningless way of communication. Taking some time to emphasize the language will reap rich rewards in later lessons. Teaching about Japan is appropriate at every level of the curriculum and in virtually any subject. Fortunately, many excellent materials are available. At the elementary level there are exciting trunk kits and artifact boxes that entice students into historical investigation as well as exploration of contemporary culture.