O'Sullivan's Island Recreation Park offers handicapped-accessible fishing and viewing platforms at the confluence of the Housatonic and Naugatuck Rivers, featuring an 80-foot-long pier extending 30 feet into the river.

The park provides peaceful riverfront access for both fishing and paddling, with nearby trailhead connections to the Naugatuck River Greenway. Free parking is available under the Commodore Hull Bridge (Route 8) with access via Caroline Street in Derby.