Kalymnos Island lagged in tourism development noticed in other Aegean islands. It was not before the 1997 that the first climbing routes were engraved. During the last decade, Kalymnos has become a popular worldwide climbing destination with more than 1200 routes in 77 climbing fields. Several commentators argue on the potential of climbing tourism for the sustainable development of the island. Climbing tourism is a niche market of adventurous tourism. Adventure tourists tend to value the environment of the destinations visited. However, little empirical research on the topic exists while no one has examined climbing tourism in Kalymnos. The present research aims to understand environmental attitudes of climbing tourists in Kalymnos and examine whether climbers are indeed aligned to alternative tourism. The New Ecological Paradigm Scale has been a widely used instrument to measure environmental attitudes and the endorsement of an ecological worldview.