Adjacent to Ada Harris Elementary School in Encinitas's Cardiff by the Sea neighborhood, Ada Harris Park occupies the Ocean Crest Road grounds within the Cardiff School District community established in 1913. The park's playground and open green space sit within a half mile of the San Elijo Lagoon Ecological Reserve's 721-acre habitat corridor, a proximity shared with the trailhead at Annie's Canyon Trail on the reserve's eastern edge. Cardiff by the Sea's 92007 ZIP code draws 12,100 monthly searches as a destination keyword, and the park's residential setting on Ocean Crest Road anchors the family side of the community away from the Restaurant Row bustle on South Coast Highway 101. The surrounding block grid connects to Cardiff State Beach and San Elijo State Beach via Birmingham Drive, giving park visitors a walking route to the coast that passes the organic juice menu at Lotus Cafe & Juice Bar on the 101. Wheelchair-accessible entrances and a dedicated parking area serve the ADA-compliant layout built to Cardiff School District specifications for shared school-and-community recreational use.