Viet Hai Island Commune, situated within the core zone of Cat Ba National Park, possesses significant potential for developing ecotourism and community-based tourism intertwined with natural resource conservation. However, the rapid increase in tourist numbers, coupled with limitations in waste treatment infrastructure, has imposed considerable pressure on the local environment. This study employed the DPSIR model (Drivers – Pressures – State – Impacts - Responses) to analyze the interrelationships among drivers, pressures, state, impacts, and responses in Viet Hai Island Commune. The aim was to assess the influence of environmental issues on tourism development. The findings indicate that the primary environmental concerns are related to solid waste, localized water pollution, and overcrowding during peak tourist seasons. While air and soil quality remain good, the marine environment and landscape elements will be negatively impacted if appropriate control measures are not implemented. Based on these results, the study proposes community-based environmental management solutions, enhanced waste treatment capacity, and increased public awareness. These measures are crucial for fostering sustainable tourism development in Viet Hai.