The paper emphasizes the importance of institutional cooperation as a prerequisite for the realization of the archaeological park which is the initiator of the development of cultural tourism and economic development of Ližnjan and southern Istria. The action plan for the development of cultural tourism is the guiding principle and the situation is visible on the spot with all its advantages and disadvantages. The situation in the area of southern Istria does not deviate from the rest of Croatia and it coincides with the results of the research that are the basis of the Action Plan. Archaeological Park Nezakcij represents an archeological site that has preserved the material remains of people's lives from the prehistoric times until the 7th century. The wealth of finds at the archaeological site is one of the few examples of a wide range of cultural heritage of the Istrian history. The aim of the work is to show that the creation of the Archaeological Park and the development of the cultural product provides the opportunity for development of tourism and economic development of the Municipality of Ližnjan that must base its tourism development on cultural heritage that is so strong that it can be the bearer of culture and tourism of southern Istria. The work consists of the introduction and three units. The introductory part of the paper gives a brief overview and concept of work and what are the objectives of the work. The first chapter presents the Action Plan for the Development of Cultural Tourism in Croatia and the trends of demand and offer of cultural tourism in Croatia. The second chapter is an overview of archaeological parks in Istria. Nezakcij is presented through history and archaeological research. The last chapter shows the Nezakcij archeological park today and the activities that take place with the aim of valorization. It also includes a SWOT analysis and a development plan which includes ideas about products that represent a blend of culture and tourism.