This Graduation`s thesis is focusing on studying, understanding and spatial planning of recreational trails in natural enviroment. Slovenia is recognized around the world for the diverse and well preserved nature. That is why it is appropriate for leisure activities in natural enviroment. This study case highlights the importance of trails in natural enviroment, benefits for health and prosperity, and the need for preservation as well as protection of nature. The key concept is sustainable and universal design, which reflects the best practices for environmental responsibility and optimizing social and economic sustainability. In this study case strategies and legislation connected with trails and facilities were also considered. Guidelines from our study case, and the best practices for achieving them, are designed for trails that permit human-powered use. The goal was to ensure that our environment is protected and preserved, while at the same time making it possible for all people to experience the joys of outstanding natural environment. Following the example of the US Forest Service the standard trail plans were developed and used for existing trail restoration in the Karavanke mountain chain.