Tourism has become a major sector of economic activity since the latter part of the twentieth century and all indications are that it will continue growing in the years to come. With this growth, a diversification of tourism products and destinations is taking place, with increased demand for nature-related tourism, including ecotourism, visitation to national and natural parks, rural-based tourism, and the like. The tourists themselves are becoming increasingly sophisticated in their demands; this is not only in terms of luxury at the various establishments they use, but especially in terms of having a meaningful travel experience, including such aspects as cultural authenticity, contacts with local communities, and learning about flora, fauna, special ecosystems and natural life in general, and its conservation.