The idea of sustainable development relies on the fact that the development of a country should not endanger the future of future generations by using non-renewable resources and by long-term destruction and pollution of the environment. Economic development cannot be stopped, but certain measures must be taken in order to have as little devastating impact on the environment and social development as possible. The challenge in today's age is to turn the aforementioned knowledge into action, to move to sustainable forms of development and a different way of life than what humanity has been taught to do. The impact of mass tourism has led to the destruction of the impressive natural landscape, the exploitation of natural resources, environmental pollution on a significant scale and the creation of other negative changes. Such a situation has created a tendency to design and introduce sustainability, which is aimed at preserving current and future resources with the aim of reducing negative impacts that contribute to the destruction of resources and the environment, which is shown in this thesis on the example of the Plitvice Lakes National Park. The main purpose and daily goal of national parks is to work on preserving the original natural and landscape values, and have cultural, educational, scientific, and recreational purposes. National parks are vast, largely unchanged areas of exceptional and natural value that include one or more preserved or slightly altered ecosystems. In them interventions and activities are possible which do not endanger the originality of nature, and if the influence of human nature (on them) is as little as possible. Plitvice Lakes National Park is the pearl of continental Croatia and our most famous, largest, oldest, and most visited national park. It is known for its magnificent waterfalls that create clear lakes in the constant biodynamic process of tufa formation and growth, which led to the formation of sixteen larger and several smaller lakes. As a national park under UNESCO protection, the importance of influencing nature conservation and raising awareness of waste reduction is an important determinant of action. In this national park, the very important need and implementation of the preservation of the environment and its entire infrastructure with the aim of applying sustainable tourism is particularly expressed. Taking care of the protection of the natural sights of the Plitvice Lakes National Park, which have an invaluable ecological value due to the development of tourism and related activities in the immediate vicinity, is very important due to its preservation in the future.