Traditional games, locally known in the Sundanese context as kaulinan barudak, are a vital repository of local wisdom, embedding values such as cooperation, honesty, and communal resilience, yet their practice among children and adolescents has declined steadily amid the spread of digital entertainment. Existing digitalization initiatives have largely reproduced single traditional games as stand-alone educational or entertainment applications developed by outside teams, while community-based tourism (CBT) studies have treated local wisdom as a valuable tourism asset without offering a concrete mechanism for embedding it into the visitor experience. This community service program addresses that gap by developing an integrated Digital Kaulinan Trail in Selasari Tourism Village, Pangandaran Regency, West Java, a nationally recognized community-based tourism destination. Using a five-stage participatory action approach, the program trained twenty-four local youths as Digital Culture Ambassadors who, together with eight elder game masters, co-produced a bilingual web-based application documenting ten Sundanese traditional games with instructional videos and augmented-reality markers, and installed eight QR-linked interpretive stations along the village's existing tourism route, tied to a village-enterprise voucher incentive. Evaluation combining a paired pretest-posttest knowledge assessment (n = 130 students) and a Technology Acceptance Model survey (n = 24 ambassadors; n = 45 tourists) indicated significant gains in cultural knowledge and preservation attitudes, together with favorable perceived usefulness and ease of use of the digital trail. The program demonstrates a replicable model that couples youth-led, elder-validated digital heritage documentation with an operating tourism economy, contributing both conceptually and practically to research on local wisdom preservation.