I originally thought that this was Mt [Mount] Ben Ard Park because that is what is on one of the gates.
Even though I live close by I did no know of this park until I came across it be accident in 2011. Dublin is full of well maintained parks and most of them could be described as "attractive" but this park is not one of them but it does have one excellent attraction and that is the free tennis courts.
The main entrance to Mount Bernard Park is located at Liam Whelan Bridge, Connaught Street with another entrance at Shandon Park. The park was purchased by Dublin City Council in 1983 from the Dominican Nuns and it extends 1.8468 hectares.