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This paper presents the development and applications of GIS-based activity-travel simulators. Two systems were developed based on the existing system, the Simulation Model for Activity Planning (SMAP) developed by the authors. One application was developed especially for the purpose of instructing students in understanding the theory of space-time prism/accessibility and travel behavior under spatio-temporal constraints. It was used in a graduate course as an educational tool (SMAP for Education: SMAP-E). The other was developed as a decision-making support system for activity planning using interactive surveys to collect information on the activity scheduling process of tourists ’ leisure activities (SMAP for Leisure: SMAP-L). Both systems were programmed with MapBasic software by customizing MapInfo GIS. In both systems, the time use of a day was represented on a timeline and the spatial component of travel pattern was represented on a map. In addition, the feasibility of alternative activity-travel patterns was tested, based on space-time prism constraints. A GIS database for a transportation network and activity opportunities with some attributes was used in the systems as input. GIS applications of activity-travel simulators were very useful not only for the decision-making support systems but also for the interactive survey tools, which could have wide possibilities contributing to further progress in activity-based analysis