Sustainable development is in many ways the fundamental basis of tourism. The importance and role of sustainable tourism development in the 21st century is at the center of this paper on eco-certificates and green procurement in the hotel industry, within the field of the responsible or green economy. The green hotel economy implies the selection of accommodation in environmentally responsible hotels and other facilities, which are directing their business operations towards green procurement, eco-labeling, and the responsible economy. This paper includes quantitative research of the attitudes of 506 international tourists, who expressed their views on their needs regarding eco-hotels and the green economy in the hotel industry. This research also included the collection of data on green (responsible) businesses by surveying 100 hotels situated in the capitals of southern Europe. Comparing results from hotels with the needs of tourists in terms of the green economy in the hotel industry, significant results were obtained that contribute to sustainable tourism development.

The Deliblato Sands Special Nature Reserve (SNR) is located in the Autonomous Province of Vojvodina (Northern Serbia). The favorable position implies the proximity to large cities with which it has good traffic connections. Romania, Hungary, Bulgaria, Croatia, and other countries from the region represent a dispersive zone. The topic of this paper is the function that the SNR has in sustainable tourism development. The objective of this work is the analytical research of the available written data, as well as those obtained after the conducted survey. The basis of the research is to find out how and to what extent the SNR contributes to sustainable tourism development. The research was carried out by measuring the value of sustainable tourism indicators, and examining the attitudes of residents, visitors, and students about the current state of sustainable tourism and the importance of the SNR for future tourism development. Respondents were selected using a random sample method. The authors used qualitative and quantitative methodologies in the paper. This research examined the SNR sustainable development by measuring sustainability indicators and surveying 1884 respondents (714 residents, 620 visitors, and 550 students) about sustainable tourism in the SNR. The obtained data were analyzed and presented with the help of SPSS v. 21 software. The research results can be used to create national and international strategies for sustainable tourism development.

The sustainable development of tourism in protected areas and the planning of its development is extremely important for mountain regions. The local population and tourists have a very important role in this process. Therefore, surveys of the local population and visitor satisfaction represent the basis of this research. The Vršac Mountains Outstanding Natural Landscape (ONL) could represent a significant destination for sustainable tourism. This mountainous area is characterized by a favorable geographical position, a diversity of natural and social factors, rare flora and fauna, and the rich ethno-social heritage of the local population. It is in a very favorable geographical position, and the proximity of the big cities Serbia and Romania, as well as many other factors, are important for tourism development in this area. A quantitative methodology was used for the purposes of this paper during our research. The purpose of this research was to investigate the influence of tourism development on the satisfaction of residents and visitors of the ONL by applying a survey technique, with the help of a questionnaire as a research instrument. A total of 1419 respondents were surveyed (789 residents and 630 visitors). The research results show that the ecological and socio-cultural dimensions of sustainability have the greatest importance for the respondents, and that these two dimensions of sustainability have the greatest impact on sustainable tourism in this protected area. Our main research hypothesis, which states that sustainable tourism has a positive impact on the satisfaction of residents and visitors, is fully confirmed. These data could be significant for tourism planning and the management of protected areas.

The Nature Park Ponjavica (NP) is the habitat of strictly protected plant and animal species, located in AP Vojvodina, in southern Banat (Northern Serbia). The area of the park covers 302.96 ha. Protection zones I, II, and III have been established in the protected area of the NP. The NP includes the middle course of the Ponjavica River, which has preserved characteristics of watercourses of plain areas and coastal remains of wetland habitats. The most valuable area of this park in terms of protection is an island with an area of slightly less than 1 hectare. According to the IUCN (International Union for Conservation of Nature), the NP is classified as the fourth category—Habitat and species management area. The good geographical position of NP is one of its main characteristics. The NP can be a destination where specific forms of tourism can be developed, such as ecotourism, nature-based tourism, birdwatching, scientific and research tourism, etc. Numerous historical sites represent a significant potential for the development of cultural tourism. The research examined the influence of institutional, economic, ecological, and socio-cultural sustainability on the respondents’ satisfaction. The quantitative methodology in this research included a questionnaire as a survey instrument for respondents. A total of 547 residents were surveyed. The results of the research indicate that there is considerable satisfaction among residents with sustainable tourism. The results of the research can help in the development of numerous tourism development strategies in which the wetland is the primary resource.

In the Deliblatska Peščara Special Nature Reserve (SNR) there are a large number of natural and social factors that affect the development of tourism. Such are: rare and endangered endemic flora and fauna that are important in the procedures of species protection, ecosystem, wetlands, socio-cultural heritage, the possibility of developing specific forms of tourism and other factors. The SNR has a relief that is present only in this protected area-dunes. This type of sand has influenced the specific flora and fauna that cannot be found in other areas. There are 18 settlements in the reserve that have significant cultural, monumental and archaeological heritage. The research aims to determine the satisfaction of residents with the function of the SNR in sustainable tourism development using a quantitative methodology and SPSS software. The responses from 510 residents indicate their satisfaction with the development of sustainable tourism in the SNR through ecological, economic and institutional sustainability of this tourism destination.

This paper presents experimental research into the attitudes of tourists towards the significance of protected areas with regard to tourism in the Autonomous Province of Vojvodina, in the northern part of the Republic of Serbia. It is an area with significant rare plant and animal resources, as well as w?tlands, ecosystems, and hilly and mountainous areas. Several research methods have been used in the paper. The first method is to collect data using a written questionnaire that was completed by 215 visitors to different protected areas in AP Vojvodina. Their answers revealed their attitudes toward sustainable tourism in selected protected areas. After examining the differences in the answers using the Kruskal-Wallis test, the results of the survey conducted by the authors were examined by means of two comparative analyses of identical, related, and similar answers in selected case studies. Based on the results of the Kruskal-Wallis Test, it can be concluded that there is a statistically significant difference in the assessments of the importance of activities and the forms of tourism chosen when visiting protected areas. The most important forms of tourism are ecotourism and adventure tourism. Tourists also identified hiking, cycling, and wildlife watching as the most important activities.