I recently came across the following, very much out of date, description of Williamstown.
WILLIAMSTOWN, a maritime village in the parish of Booterstown, partly in Dublin barony, but chiefly in that of Rathdown, Dublin county, 3 1/4 rules S.E. from the General Post Office, Dublin, comprising an area of 46 acres, Population 575, inhabiting 94 houses.
It is situated upon the S. shore of Dublin bay, close to the Kingstown railway, and on the road to Bray. It was formerly much resorted to as a bathing-place, and is still frequented for that purpose. There are hot and cold salt water Baths, and a Metropolitan Police Station. In the neighbourhood around, approached from Booterstown or Blackrock, there are many handsome seats and villas, the principal of which are Ruby lodge, Belleview, and Seafort lodge.
Numerous jaunting cars to and from Dublin to the Blackrock and Kingstown, ply constantly through the village at it fare of 6d. The nearest Post Office letter receiver is at Booterstown.