Contemporary cities face socio-environmental challenges that, if not addressed, undermine their sustainability and the well-being of their populations. Nature-based solutions are internationally recognized as one of the most efficient long-term strategies. Among these solutions, the Urban Green Spaces (UGS), as bridges of connection between nature and the urban, assume themselves as places of socialization, physical, cultural, and recreational activity, in addition to being able to play a role in mitigating atmospheric pollution and the effects of climate change. Although there is a considerable amount of literature dedicated to these spaces, there is still a gap in how the potential of ecosystem services, preferences, motivations, and emerging relationships of their users are mediated, considering the surrounding socioeconomic and territorial profile. Taking as a case study the city of Porto, located in the northern region of the Portuguese coast, integrated into the second largest area of the country, which suffered a significant loss of urban green structure during the second half of the 20th century, this investigation aimed to understand how UGS are responding to contemporary socio-environmental challenges. Of the 95 UGS identified in the city, twenty-five were selected, to which a triangulation technique approach was applied, namely the construction and application of a grid to assess the potential of ecosystem services, the construction and application of a questionnaire survey to 131 UGS users and, finally, the mapping of the human behavior of 975 users in four of the 25 UGS. Through univariate and multivariate statistical analyses, and using SPSS, R, and ArcGIS programs, it was possible to respond to the objective of the present investigation. The results make clear a situation of environmental injustice in the provision of UGS in the city, considering that, in areas of greater socioeconomic deprivation, these spaces tend to have less potential for ecosystem services, in general understanding by users. To propose a typology of UGS, five groups were identified: environmentally capable and socially expectant spaces, socio-environmentally active spaces, environmentally capable but socially dynamic spaces, socio-environmentally neglected spaces, and socio-environmentally unexplored spaces. With this proposal, it becomes possible to identify the dimensions that most need intervention, in addition to observing that the last two groups, with less potential for ecosystem services, are those that aggregate UGS that are in areas of the city of greater socio-economic deprivation. UGS are used to relax, socialize, and contact with nature amongst the dense urban fabric, in addition to promoting greater ecological awareness as the degree of attendance increases. The mapping of human behavior also revealed patterns and regularities between behaviors and the design of the UGS, as well as natural elements and urban furniture, contributing to a greater correspondence between human needs and space. In addition, the UGS with greater dynamism and frequency of users are in less deprived areas of the city. The answer to the objective initially proposed is that the UGS are responding to socio-environmental challenges at two paces: if, on the one hand, their socio-ecological potential is used by their users, on the other, not everyone benefits from them in an equitable way. The greatest expectation is that the results of this work can be a contribution to the definition of local strategies that enhance the ecosystem services of the city's UGS, providing equitable access for all to these spaces and satisfying the needs of their users toward green cities, fair and inclusive.