Cultural ecosystem services (CES) play a key role in the sustainable development of rural areas—yet they remain poorly quantified in planning practice. This study examines the relationship between the supply and demand of CES provided by various types of Ecological Focus Areas (EFAs) in a rural landscape, using the municipality of Sosnowica (eastern Poland) as a case study. Landscapes such as forests, agricultural land, wetlands, and inland waters were evaluated using a set of biophysical and socio-economic indicators that reflect both their potential (supply) and actual use (demand) in terms of services such as recreation, landscape aesthetics, and cultural heritage. The findings reveal significant spatial disparities between CES supply and demand: forests and inland waters exhibit the highest supply potential, while agricultural land shows untapped opportunities in tourism and recreation. Wetlands, in particular, face notable service deficits—highlighting the need for targeted infrastructure and management interventions. Statistical analyses (Pearson correlation, Kruskal–Wallis test, Tukey HSD test) confirmed that the key factors shaping CES are accessibility and environmental attractiveness. The results indicate that CES mapping is a valuable tool for supporting sustainable rural planning, reinforcing local identity, counteracting depopulation, and stimulating socio-economic development.