Korean government has initiated the special law for Jeju International Free City in order to build Jeju-Do as an international city focusing on tourism and leisure. Even though Jeju has been recognized as the best favorite tourism site possessing the preserved natural resources in the nation, it faces a risk due to the lack of tourism programs and efforts to develop tourism resources. Indeed, since the trends of tourism development have been oriented in a large scale development that caused to a serious destruction of natural environment, social conflicts between developmentalists and environmentalists have been aroused. In these circumstances, ecotourism has been emerged as an alternative tourism that minimizes its impacts upon environment and emphases on ecological sustainability. In this sense, the purpose of this paper is to propose the development alternatives for tourism development under the assumption that ecotourism is the best suitable tourism type for Jeju island. In order to fulfill this purpose, following three subjects have been investigated and analyzed : 1) status of ecotourism with a wide examination of ecological characteristics of Jeju, 2) analysis on recognition of tourists and citizens regarding ecotourism development, and 3) the possible development alternatives extracted from a comprehensive understanding and examination of 1) and 2).