Ecotourism has become one of the tourist's favourites. Bangsring Underwater (Bunder) tourism is marine ecotourism in Banyuwangi East Java, that has increased tourist visits. Bunder's management involves the local community. Community engagement is expected to have a significant impact on the better management of natural resources. However, the implementation of ecotourism management from various elements other than society encounters some difficulties, especially in balancing between the objectives of improving people's quality of life, the pressure of tourism activities in the marine environment, or the utilization of wisely maintained resources. This research aims to design the objective structure of the program and determine what factors are the key to the development of marine ecotourism. The research method uses library studies and expert assessments to assess the subelements of the program's objectives, and the next stage uses Interpretive Structural Modeling analysis to design structures and determine critical factors for marine ecotourism development. The results of the research analysis found there are four levels of goal structure, and the vital elements in the development of marine ecotourism are improving people's quality of life, improving service services, realizing sustainable resource utilization, realizing maritime tourism management arrangements, expanding employment, and increasing people's income. The balance of objectives for sustainable coastal resources, tourism business performance, and community wellbeing is important to the common consciousness.