This study demonstrates the power of integrating GIS with SDSS for a tourism application. GIS-based SDSS provide useful tools to help tackle many semi-structured spatial decision problems that we often encounter in the real world. For the visitors of GSMNP, there are many resources and activities awaiting them to explore and experience. However, most visitors have no or very limited knowledge about these possibilities. It, therefore, presents a challenging task for the visitors to plan their activities in the park to deliver the experiences they are looking for. Since different visitors often look for different activities and experiences based on their personal preferences and constraints, it is not feasible to find one optimal plan for everyone.