||The interest in extreme or adventurous sports has grown rapidly in the last decade. Activities such as skydiving, paragliding, zip lining, canyoning, swinging bungie etc. are experiencing a burst out in number of enthusiasts and challenge audacity. A huge progress has been made also in the corresponding technical equipment. Among mentionedadventuroussports, perhaps the most popularis mountain biking. Since most of these activities happen outdoor, preferably in nature or even better in preserved and remote corners of nature, they inevitably have a significant impact on other usersand inhabitants within these places, e.g. animals and their habitats, hikers, farmers, villagers, foresters, land owners, nature conservationists etc., who have been sharing the placemore or less reconciled with each other since a long time. Now, this new presence has become an everyday reality andit brings a conflict between ‘old and new users’, which cannot be ignored. Therefore, these activitiesneed to be properly integrated into thenatural environment and into the legal system, whichis easy to say, but much more demanding to accomplish.