Keewaydin State Park is a 282 acre state park in the Town of Alexandria in Jefferson County, New York in the United States. The park is located along the St. Lawrence River, southwest of the Village of Alexandria Bay on New York State Route 12. Open year-round, the park offers a swimming pool and showers, picnic tables, a playground, a campground with 48 campsites, fishing and ice fishing, cross-country skiing, and a boat launch.