Intra- city natural structures have an important role in developing city qualities and the promotion of its aesthetic, ecological and social values which also allow people to have their recreational activities. As Tehran river-valleys have been damaged according to users’ behaviors and irregular constructions, the present paper aims to identify the typical behavioral characters of tourists in Darband river-valley and to study design solutions in order to decrease the damages caused by their incompatible behaviors to the nature.The methodology of this research is Every-day life sociology or Ethnographical methodology, which considers the relationship between behaviors and the surrounding environment. Users’ behaviors have been observed and photograph all along the river-valley path, which were illustrated through maps, called behavioral patterns. These maps were categorized in three sections including behaviors in the morning, at noon and at night. In the next phase, visual analysis was completed based on aesthetic criterions and behavioral analysis according to their impact on natural environment, in order to consider compatibility of behaviors to nature. Design approach was the conservation of the river-valley and to encourage compatible behaviors and to reduce the incompatible ones. Regard to research results, with the help of design, users behaviors could be adjusted to the nature as a recreational area, which would conclude in its conservation.