Sebago Lake State Park. This 1,400-acre park on the north shore of Sebago Lake is a great spot for swimming, boating, and fishing for both salmon and togue. A pleasant picnic area is Songo Lock State Historic Site, an operational lock along the twisty, narrow Songo River. Bicycling along the park's roads is a popular pasttime in warm weather. Come winter, the park's 6 miles of hiking trails are groomed for cross-country skiing.