This qualitative exploratory study focuses on marriage immigrant women and explores the possibility they might contribute to the sustainability of the host country. A sustainable society, the contribution of visiting friends and relatives (VFR) tourism to destination sustainability, information behavior, and fringe stakeholder involvement for sustainable destination management are the focus of this study. Vietnamese marriage immigrant women in South Korea were investigated; the reasons for the investigation include: their increasing numbers, their significance caused by the roles both at the household and the societal levels, and the increased diplomatic ties between Vietnam and South Korea. The narratives of 16 informants about their leisure, hosting of friends and relatives, and information sharing patterns show that Vietnamese marriage immigrant women’s leisure and travel facilitate their subjective well-being and the enhancement of social capital, which potentially contribute to a sustainable society. Their hosting experience of the visits of friends and relatives, and its implications for sustainability, are further discussed. Furthermore, their roles as information mediators suggest their potential to contribute to the formation of the host country reputation. Self-appraisal of their unique travel patterns provides implications for involving this group for destination management. We consider both their importance and constraints as contributors to the host country attaining sustainability, and the implications are discussed.