Tourism development is dependent on its natural environment. A friendly environment is not only essential for sustainable tourism development, but also can be as an unique attraction for tourists. The purpose of this study is to identify the relationship among eco-tourism value, customer satisfaction, and the behavioral intention of Tongyoung Island. Appropriate measures were taken to test 250 people who visited Jangsado of Tongyoung Island using cross-sectional survey. This study shows that emotional and epistemic value positively influences customer satisfaction while functional value has no influence. Epistemic value has a positive effect on behavioral intention while emotional value and functional value has none. Customer satisfaction positively influences behavioral intention. In addition, emotional value and epistemic value both have a positive indirect effect on behavioral intention. This all shows that customer satisfaction mediates the relationship between eco-tourism value and behavioral intention. Thus in order to attract more tourists, managers should focus on eco-tourism value.