The implementation of good sustainability practices has always been part of Marinha Guincho's priorities. Being integrated in the Sintra-Cascais Natural Park, Marinha Guincho has been actively cooperating with various environmental entities to ensure the full respect for the surrounding environment and the local eco-systems.

With a construction area below 10% of the resort's total area and an investment in numerous green areas and parks, Marinha Guincho has been extremely careful in the preservation of the surrounding environment.