The Siwanoy Trail consists of a trail system that originates in the Central Woodlands section of the park. Originating at City Island Road, it bears to the northeast before splitting into two spurs, one going east to the Rodman's Neck meadow and the other going north around Bartow Circle. At the circle's eastern side, the trail splits again. One spur goes northeast in a self-closing loop to the Bartow-Pell Mansion, and the other goes northwest to connect to Split Rock Trail before going around the Hutchinson River Parkway's interchange with Orchard Beach Road.