This paper examines the benefits of incorporating ecotourism programs into the adult education curriculum. Social education and lifelong learning ("shougai gakushuu") are terms used to refer to adult education and related activities in Japan. Adult education originated immediately after Second World War with the enactment of the Fundamental Law of Education (1947; revised in the 1980s). Since the mid-1980s lifelong learning has been the more commonly used term. Lifelong learning involves not only going to school to learn how to read and write, it can also involve the learning that takes place outside the classroom--through volunteering, outdoor activities, sporting events, and so on. A literature review was conducted as the means to pursue the aim of introducing ecotourism into adult education. Education for Sustainable Development was examined to see how its contexts can be applied to Japan's adult education. This paper is aimed specifically at how the host community can learn, from adult education centers in their communities, to practice a sustainable ecotourism. Although there have been researchers and communities who are against ecotourism practices, this paper maintains that, with proper education in night schools and adult and community centers, of the benefits of ecotourism these communities will accept and welcome ecotourism. However, the government first needs "shakai kyouiku" to re-examine and re-write the adult education curriculum so as to include ecotourism.