Besides enjoying the architecture of Civic Center (aka the area where City Hall is), Gothamist suggests you check out British sculptor Julian Opie's installation in City Hall Park, Animals, Buildings, Cars and People. Some highlights: There are two LED sculptures on the steps of the Tweed Courthouse; two full-size car sculptures; three glass scultupres of women; animals sculpted of wood; a group of plywood bulidings; and aluminum signs of white sheep grazing. Here's a PDF of a map and list of his artwork.

And Gothamist found it cute that the press release said, "He has rarely shown his sculptures in the United States, though his recent album cover for The Best of Blur is familiar to many."