||In recent years, we have observed how, worldwide, the goal of nature preservation has to be developed in a scenario of continuous increment in the number of visitors who are interested in experiencing PA resources, landscapes and stories. Spain is a good example of this process. It’s estimated that the whole Spanish PA receive over 50 million visitors a year, ten of them to the National Park System. The progressive influx of visitors in a short period of time has made administrations and managers to offer and develop a broad network of facilities and programs in order to provide these visitors with information, knowledge and recreation. But, are we doing it in the best way? In this context, this investigation defines an evaluation tool to asses the quality of public use programs developed in National Parks which has been applied to the Spanish National Park System, and could be applied to other parks and systems. It examines different trends and provides with some future recommendations.