Funland

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.

Sidestory
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.

Location
Funland is located on Firefly Beach in the Firefly Projects, south Broker.