Nan Old City’s sustainable tourism model is based on the Global Sustainable Tourism Criteria (GSTC), focusing on balanced socio-economic, cultural, and environmental development. By engaging local stakeholders from public, private, and civil sectors, the city ensures coordinated tourism practices that preserve its heritage. Nan’s efforts have been recognised with the Green Destinations Top 100 Stories award in 2020, 2021, and 2023. Initiatives such as cultural preservation programmes, eco-friendly transport options, and environmental education centres contribute to a sustainable and meaningful travel experience, maintaining Nan’s historical integrity for future generations.