We are aware that the efficient use of time is important for individuals. However, the fact that urban dwellers trying to live in cities have limited free time to spare for themselves creates difficulties in terms of the development of social well-being. The presence of technology, which has recently developed in the world, in our individual lives is indisputable. However, the long transportation times of individuals living in the city during the day is an important factor that causes the lack of free time periods. Matching the presence of technology with smart equipment that urban dwellers can enjoy and use in a sustainable way at appropriate points in cities will contribute to the happiness of society. This formation will actually provide us with the opportunity to transform technological renewal in cities into happy cities. For this reason, both the concrete existence of the concepts of smart city and happy city in 4 major cities of the world (Istanbul, Indiana, Amsterdam, Shanghai) and their reflections on the city dwellers are examined. Through interviews with the relevant people who serve the concepts of smart designs, technologies, recreational equipment and happy cities in the cities and concrete data, comparative sources of information on recreational technologies, sustainable and happy cities are provided. These sources consist of people who provide services on recreational technologies and services in the mentioned cities. The purpose of the sample group is to obtain information about city recreational technology studies from people who serve recreational city technologies, as well as to examine their views on city technologies and city happiness. In our study; the reflected and measurable (United Nations World Happiness Reports) dimensions of the concept of happy city are tried to be put forward in a scientific sense by comparing the examples created in cities and their reflections. In my 3rd TİK report on the thesis, the purpose of the study, the research model, the tools used to obtain data in the research, purposive sampling, research reliability, analysis, thematic coding information, ethical evaluation and the sample group information of this study applied online to 4 countries in 3 different continents, the table of research cities information and the findings (maxqda maps) graphics were added. In addition, general information about the concepts of leisure, recreation, smart city and happy city, which constitute the main theme of the research, is included.