Treeful Treehouse Sustainable Resort is a resort located in the forest of Yanbaru, Nago City, Okinawa Prefecture, where guests can stay in real treehouses. With a concept of coexistence with nature, the resort's sustainability practices are implemented in various aspects, including architectural design, building materials, water usage, waste management, the use of renewable energy, avoidance of fossil fuels, spatial planning, and collaboration with the local community. During their stay, guests can enjoy a variety of activities that immerse them in nature, such as river trekking, a sauna treehouse with a slide into the river, and fireside dinners.