The bay of the Grand Cul-de-Sac Marin is a remarkable area that concentrates various socio-economic, cultural, biogeographical and ecological issues. It is one of the most closely monitored sites in Guadeloupe (Ramsar site in 1993, Biosphere reserve in 1994, part of which was classified as a national nature reserve in 1987, then integrated into the marine heart of the Guadeloupe National Park in 2009). Despite these provisions, the area is subject to conflicts of use, a lack of rigorous enforcement and haphazard development. The Guadeloupe National Park’s territorial charter proposes shared governance of the park’s territories. For this reason, the 2 main managers, the Conservatoire du littoral and the Parc national de la Guadeloupe, have drawn up a strategy for the sustainable management of visitor numbers, accompanied by concrete proposals for action, enabling activities to be better distributed according to the sensitivity of the environment and the potential of the sites.