The purpose of this paper is to describe and explain GIS capabilities and potentials in identifying tourism resources and assisting planners in decision making. This paper will further discuss a case study in which GIS application was applied in identifying resources in Pulau Pangkor, Malaysia and several methodological limitations in applying this application. With the aid of GIS technology, it is believed that sustainable development, which is the main concern today, can be implemented in not only Pulau Pangkor and but also in other countries in Southeast Asia. With its usage, many tourism resources in this region could have proper development plans in minimizing negative impacts on not only the resources but also local communities. Southeast Asia is rich of many different cultures, heritage and environment which are worth preserving.