The park with the red bridge and the traditional buildings was a common filming location for TVB. The park has been demolished for the expansion of Ocean Park by the former owner the Jockey Club Hong Kong. There was an ancient village in Ocean Park but it closed down in 2007, there were some copies of historic buildings that look like the ones used in the TV-series.
Pictures below show scenes shot at Ocean Park (estimated before the August 84.5 broadcast). The filming was on the same day. Yung MeiLing changed three sets of clothes (yellow dress, pink dress, and blue dot dress). Micheal Miu changed two sets of clothes, and other actors also participated in the filming.
More information about Ocean Park