Pedestrian simulation tools are usually used to evaluate pedestrians’ evacuation/security in buildings (closed environments). The paper’s objective is to develop a methodology for the application of these tools in urban planning (open spaces), where the pedestrian behavior is more complex. The area studied is Plaza Baralt, in Maracaibo Venezuela, an area enclosed by historic buildings. The proposed scenarios and pedestrian flow simulations – based in cellular automata – followed a locally adapted data recollection and site analysis. As a result the methodology allows the designer to analyze various scenarios, fast and efficiently, identifying problems of areas, flow, land use and user profiles.