This article offers qualitative insights into the way visitors to a Greek reserve negotiate the duality of ecotourism in visitors books. This is a neglected issue in general, and within ‘Ecocritical Discourse Analysis’ in particular. Using as ‘map’ a Content Analysis undertaken in a previous study, we now conduct a lexical analysis to two of the major discourses drawn for the shaping of images of the natural environment of the reserve (tourism and environmentalist discourses), in order to reveal the conceptual organization of such images. By also using the descriptive tool of ‘macro-speech acts’, images are positioned within a ‘tourism-environmentalism continuum’. The results of the analysis indicate that although in the visitors book of the information center environmentalist images dominate, in that from the observation site, tourism images prevail. Moreover, the two samples differ in the way they shape environmentalist images. In conclusion, with very few images being positioned at the middle of the continuum, the two social practices do not function in a complementary way, leading to a dualism rather than a duality of ecotourism.