Onna Village in Okinawa is a popular tourist destination surrounded by rich natural environments, attracting visitors both from Japan and abroad. The village is blessed with mountains, rivers, and the sea, with marine tourism playing a central role in supporting the regional economy. However, the rapid growth of tourism has brought to the forefront issues such as environmental degradation and the sustainable management of local resources. This paper examines the development of marine tourism in Onna Village, the challenges that have emerged from this growth, and the regional management strategies designed to address these challenges.