Pier 4 Park is located on the southwestern shore of Lake Ontario, just east of Bayfront Park. Pier 4 Park contains a parking lot, a washroom building, multi-use trails, looped pathways, SOBI bike stations, a spray pad, a playground with a tugboat play structure, a beach, a pier boardwalk with gazebo structure, a breakwater, a drinking fountain, seating areas, lighting, shade trees and a large open grass area sometimes used for events.
The park is bounded by the lake to the north and west. Marinas and boat clubs line the lakeshore to the south and east. Bay Street North runs along the southeast side of the park with residential areas beyond. Leander Drive to the east provides vehicular access to the parking lot and maintenance vehicle access to the park pathways. Pedestrians and cyclists access the park via the Waterfront Trail or a down a series of ramps from Bay Street North.