This research aims to propose environmental prevention and mitigation on fragile coastal ecosystems due to the actions of the tourist architecture, using methods of life-cycle assessment of buildings, matrix methods of the actions that cause severe environmental impact and statistical processing through multivariate analysis. A study of projects was undertaken in Cayo Coco located to the north of Ciego de Avila, Cuba, being built today and where the tourist development of the archipelago Sabana-Camaguey started. It has been determined that suitable architecture would decrease the negative impact of these fragile ecosystems.