“…According to Finnessey [14], there are three main sources of impact left on national parks by tourists: depletion of natural resources, pollution and physical impacts. Visitor impacts, caused by sport and recreational tourism activities (walking, hiking, backpacking, rock climbing, horseback riding, camping, vehicle use and biking) have relevant negative impacts on national parks [15]. Vegetation is being trampled, soil compacted and ecosystems destroyed, because of the growing number of tourists coming to these areas.…”