In the context of national park management, landscape conservation, and tourism development in a mountain region in Norway, the aim of the research is to analyse how tourists, residents, and local stakeholders experience and practise their participation in the landscapes. A mixed methods approach was used, which included focus group meetings, semi-structured interviews, an on-site survey, and two Internet surveys to gain in-depth knowledge of tourists' and locals' relations to and evaluations of the landscape in the studied national park region, which comprised the park itself and eight protected landscape areas. The results revealed that many of the tourists visiting the national park considered the area it covered was a wilderness, while locals considered the area's authenticity was closely connected to cultural traditions and a long-lasting interconnectedness between people and landscape. As both locals and tourists shared a desire to maintain the wildlife and landscape characteristics of the national park, authenticity may serve as a common denominator for emphasizing local development, outdoor activities, and meeting points outside the boundary of the park. The authors conclude that involving tourists in a knowledge process that provides insights into the past and present livelihoods of communities and the use of the natural resources could help to enhance tourists' experiences, but without compromising local understandings of authenticity. •Identifying the value gap between locals and tourists by using a mixed methods approach.•Portrays the dichotomy of nature and society in a local context.•Describe the contextual and dynamic relation between people and nature.•Provides an example of empirical way to explore mountain environment complexity.•Managing landscape by an understanding of authenticity.