Today, tourism is one of the largest drivers of the national economy, both in the world and in Croatia, with a high percentage of GDP for years, accounting for a total of 16.9% last year, or 10.4 milliard in total turnover, according to the Development Strategy tourism is expected to grow to 14 milliard euros this year. Given its enormous revenue, it is necessary to pay him great attention, especially since, in addition to having a positive impact, it also has major negative impacts on the destination in which it takes place. The environment is the primary tourist resource and requires quality and well-preserved space for its development. Tourism in some destinations is becoming quite a polluter, but also the guests themselves, who are many times more than the local population during various tourist activities, affect the very infrastructure of the destination. Accordingly, care must be taken to reduce the negative impact of tourists and tourism on the destination, ie to introduce projects and companies that will deal with sustainable tourism in order to increase the quality of service and guest satisfaction. The aim of this paper is to show how mass tourism has influenced Croatia, and what measures and practices Croatia is implementing to promote sustainable development, both within the whole of Croatia and the tourist destination itself.