The study applied government open data to determine the main types of activities to effect on tourist population and ticket sales in Taiwan National Forestry Recreation Areas. Through multilayer perceptron analysis, the relationship between activity, tourist population, and ticket sales was estimated. The study areas were Basianshan, Alishan, and Taipingshan National Forest Recreation Areas. The data were collected from 2007 to 2011 reported by the Forest Bureau in Taiwan. The results of the investigation showed that tourist population and ticket sales were influenced by different kind of activities. The frequency of large entertaining activity was key factor to influence tourist population, and the frequency of large natural-experience activity was key factor to influence ticket sales. To influence tourist population and ticket sales, the frequency of large entertaining activity and small social activity should be considered.