The Serious Leisure Theory (SLT) proposed by Stebbins (Stebbins, 1992) has been extensively applied to several major categories of social activities. In this study, we choose Leisure Diving Activities as an example to examine the purposes and corresponding benefits of amateur-type, leisure sports in modern Taiwan society. We generated an interview procedure based on SLT guidance, and had applied it in to an open-style interview for eight divers (four males and four females) in a private club of a northern Taiwan hospital. In personal aspects, our results indicate that participants would like to gain self-fulfillment, self-realization, self-expression, and personal reconstruction (from fear, negative personality or pressure); to improve sense of achievement, self-image, self-satisfaction, and the use of leisure time. From the social point of view, they also like to facilitate social attraction, family interactions, group contribution and environment protection. Our findings greatly support SLT. It is worth noting that diving is a highly professional activity, elevating the importance of self-fulfillment for participants. They would like to have more focus on enjoying the beautiful sights instead of the fluency of diving skills. Some participants’ are also benefit by recruiting family relatives to the activities, for which is rarely observed in other serious leisure activities. However, since team work and safety are the major concerns for leisure divers, personal and team creativities have been sacrificed substantially during the activity.