“…The impacts are often negative, resulting in undesirable changes to the natural environment (Leung and Marion, 2000;Buckley, 2004;Pickering and Hill, 2007). With increases in visitation in many protected areas, impacts are becoming increasingly widespread (Leung and Marion, 2000;Monz, 2000). As a result management agencies for national parks around the world are commonly faced with the challenge of balancing potentially contradictory management goals: to preserve the natural character of the protected area while also facilitating recreation opportunities (Monz, 2000;Worboys et al, 2005).…”