Geocaching is a recreational sport activity considered as a postmodern treasure hunting game. Associated with the movement to distant places, the search for new landscapes, culture and adventure, geocaching is being integrated into the tourism industry. In spite of its growth and economic significance, few studies have been developed to understand this sport tourism activity. Thus, this study was developed to understand the geocaching practice profile, geocaching travel behaviour and the motivations for the practice of geocaching, and to examine whether these variables are associated with the socio-demographic characteristics of geocachers. An online questionnaire survey was applied to geocachers living in Portugal, and 613 responses were obtained. The results show that geocaching is a recent sport activity in Portugal, whose motivations for practice are related to nature and escape, and that geocachers have a strong disposition to travel, highlighting the potential of geocaching for sport tourism. Statistical tests also revealed that socio-demographic characteristics are not associated with the geocaching practice profile and geocaching travel behaviour. However, the socio-demographic characteristics are associated with the motivations for the practice of geocaching, particularly when compared by sex, age and education level. Management and marketing implications for sport tourism operators and destinations are discussed.