The concept of sustainable development was created as a result of an increased understanding of the importance of environmental conservation. Sustainable development in tourism is a long-term goal of tourism. It is important to preserve the cultural and natural heritage and, meet the needs of tourists today, but also to enable the same for the coming generations. Eco-friendly hotels operate in accordance with the principles of sustainable development. This way of doing business reduces negative environmental impacts and increases business efficiency. Tourists are becoming more and more aware so they are searching for “green” accommodation. More and more hotels are deciding to swich on "green” kind of business. Positive aspects of eco hotels are shown through several practical examples in the world and Croatia.