Funland, an amusement park in GTA IV, is a rendition of Coney Island, in New York City. Though Funland is not an interactive location, it can be visited in-game. Some attractions include "The Screamer", a roller coaster, tea cups and mini-golf.
During the mission First Date, Niko suggests they visit the "fun fair", just a short drive away. When you arrive, your date notes that the location is closed, and probably wouldn't pass safety regulations.