This paper aims at providing an example on how to conduct experimental-design study. The example study was launched to assess whether recreation participation (guided by the Dunlap-Heffernan hypothesis) and/or interpretation service influence park visitors’ environmental concern. Results showed a significant effect of recreation participation when integrated with interpretation service. Specifically, interpretation can enhance recreationists ’environmental concern with a larger effect on a consumptive form. Nevertheless, limitations to the study include the fact that recreation activities chosen in this study do not fully represent all activities offered at the park. Grouping recreation activities into appreciative-consumptive typology can limit an understanding about the diversity of recreation experiences. In addition, participants’ environmental concern may not translate to their environment-friendly behaviors. Despite these weaknesses, the study offers various contributions. While most recreation literature is from North American, this study offers perspectives from a developing and non-Western county. Most importantly, being grounded in experimental design with a greater control on the study’s intervention, results thus serve to increase confidence of cause-effect relationship, which is different from existing correlational research. It is important to acknowledge that this study is to showcase the possibility to integrate experimental design in social science research. Definitely, the motivation of this research is based on the ontology of positivism. Yet, it is not intended to show off that this value is superior to other competing paradigms. As concluded by [10], “There is no single philosophy of science, and so there can be no single method of science either” (p.30).