This study used the practical techniques of a qualitative triangulation method as the basis for interviews and a strength, weakness, opportunity, and threat (SWOT) analysis for identifying differences between Okinawa and Taiwan regarding the quality of tourism-related car rental services. In adopting the method of a case study, this study investigated the procedures of car rental services and quality of tourist services in Okinawa by visiting one of the branches of OTS Rent-A-Car in Okinawa to rent a car, thereby conducting an on-site investigation of their service quality. The duration of the investigation period was 8 days, from November 12 to 19, 2018. For this practical technique report, the researchers arranged a visit to the DFS branch of OTS Rent-A-Car in Okinawa to investigate their service quality and procedures. Furthermore, the researchers visited the Zhonggang office of the Hotai Leasing Corporation on January 5, 2019, and conducted an on-site investigation to compare car rental services in Taiwan and Okinawa.