Suitable management for ecotourism development is essential in order to be able to maximize the positive impacts and minimize negative impacts on all aspects of tourism. Therefore, this study is an attempt to identify potential ecotourism sites using GIS andAHP; a case study of Surat Thani province, Thailand. The integration of the AHP in GIS combines decision support methodology with powerful visualization and mapping capabilities which in turn should considerably facilitate the creation of land use suitability map (Marinoni, 2004). This is also an additional benefit achieved by integrating geo-scientific aspects in the land use decision process, as demanded by Agenda 21 (Lamelas et al., 2008).