Tourism is an important driver of growth, which raises the national income of many countries. Nevertheless critics consider that tourism development is self-destructive and in the long run it contributes to environmental destruction. Increasing numbers of tourists often threaten the quality of life and environment. Concomitant with the rapid development of the tourism industry, there are increasing environmental problems like rising greenhouse gas emissions, increasing noise, declining air quality, increasing water pollution and biodiversity loss, draining of wetlands, destruction of coral reefs, etc., leading to depletion of nature. Therefore, the International Union for Conservation of Nature in 1992 lists tourism as the second major threat to protected areas. Owing to the increasing negativities of tourism, several authors reiterated that tourism industry should grow carefully and in a sustainable manner. The Rio+20 Outcome Document “The Future We Want� highlights the role of sustainable tourism so as to come out of the adverse effects of tourism. The United Nations defines sustainable tourism as “Tourism that takes full account of its current and future economic, social and environmental impacts, addressing the needs of visitors, the industry, the environment and host communities �. The most important aspects of sustainable tourism are that it ensures long-term economic operations, provision of fairly distributed socio-economic benefits to all, through income-earning opportunities and social services to host communities. Thus it serves dual purpose-conservation of natural resources and poverty alleviation.