This Research Paper deals exclusively with the pros and cons of Sustainable Tourism in present-day Nepal, easily one of the world’s most outstanding mountain tourism destinations. The challenges that this new form of Tourism throws and ways and means of popularizing the Sustainable Tourism experience of Nepal to a worldwide clientele has been covered in this Research Paper. A sincere attempt has been made to unravel Nepal as a marvelous Eco-Friendly & Sustainable destination. Issues like promotions, balancing Casino and Sustainable Tourism, conservation of Nepal’s fragile ecological diversity, the role of youths in tourism etc… have been dealt with methodically. The intention has all along been to create a synthesis out of the Tourism phenomenon. The Research Paper highlights and justifies the need for Sustainable Tourism in Nepal and attempts to satiate the burning desire of modern day traveler for an experience that has the effect of transformation and making them processed human beings. Keywords: Eco-Tourism, Nepal, Sustainable, Mountain, Conservation, Flora & Fauna, Ecology.