a) Sustainable tourism must optimize the use of environmental resources, focusing on the preservation of biodiversity, the conservation of natural resources and the adoption of ecological processes b ) Sustainable tourism must respect the social and cultural values ​​and protect the traditions and heritage of the host regions, while preserving the authenticity of the host communities c) Sustainable tourism must promote the economic growth and social well-being of the host communities through improving employment, providing economic opportunities, equitably distributing benefits to stakeholders and helping alleviate poverty (WTO,