The conservation efforts by Kadilangu community have produced the enhancement of mangrove forest area, however the utilization of mangrove forest conservation by people around was limited. The conservation effort was analyzed descriptively based on Indonesia Government Rule Number 5 of 1990 and Number 32 of 2004. To make the conservation effort sustainable, it needs to develop community-based ecotourism (CBET) at Kadilangu mangrove forest, so as they can utilize mangrove forest benefits. Mangrove forests protect coastline by preventing abrasion, enrich coastal waters, support coastal fisheries, give additional benefits for biodiversity, and improve ecotourism industry. This research intended to study the conservation and ecotourism effort in Kadilangu Village and the community perception of both conservation and ecotourism toward sustainable socio-economic development. The data collection was undertaken through field visits and interviews using simple random sampling. In addition, to investigate the ecotourism potential at Kadilangu mangrove forest this research using parameters obtained from key informants interview which are divided into four components. In addition, to estimate the value of economic potential of Kadilangu ecotourism mangrove forest, this study using Travel Cost Method (TCM). The Six-Pack Training Pilot Project is a recommendation to solve the problem of CBET in Kadilangu. The results are supposed to give strategies on how to maintain sustainable management of CBET. Therefore, conservation efforts and community’s welfare at Kadilangu improved significantly.