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The purpose of this paper is to examine the reasons that keep individuals from participating in three nature-based tourism activities registering limited growth in contrast with the increasing popularity of tourism in general. The three-dimensional leisure constraints model was used as the theoretical framework for the study. The sample consisted of nature enthusiasts from several US states who showed an interest in nature tourism but did not participate in the selected activities during the last two years. Confirmatory factor analysis partially supported the three-dimensional model across the activities. Repeated measures comparisons showed that the importance of leisure constraints varied across them within the same group of individuals.