A key feature of voluntourism is that participants expect both to be entertained and to help others to different extents. The duality between the leisure and volunteering aspects of the trip creates ambiguities in expectations. This article focusses on group sensemaking about this leisure-volunteer duality and the role of trip leaders in its management. It uses a case study approach to investigate the behaviours of participants on a voluntourist trip to South America. Among other things, it compares participants’ ex ante expectations with ex post evaluations of the trip and tracks the events that shaped views on the quality of the experience. More concretely, the key events that triggered conflicts between the leisure and volunteer dimensions of the trip are identified and analysed using the factors that influenced the sensemaking outcome. Implications centre on the importance and use of sensemaking tools for voluntourist organisations and trip leaders in the management of the leisure-volunteer tensions that are part and parcel of voluntourism.