DeLury Square Park is in historic downtown FiDi/Seaport. It is located on Fulton Street/Gold Street and connects the WTC, Fulton Center Hub and the South Street Seaport.
Transportation: Trains stop at various locations throughout the area (Fulton Center is centrally located) so check the MTA site.
The following trains will give you access to this area and DeLury Square Park.
A,C 1,2,3 4, 5,6 J,Z N, R. WTC PATH
There is the “Connection Bus” that runs between the Seaport and Battery Park City.