Try to reserve a lakeside spot at this pleasant campground. Note that campsites are 'dry' (no running water) in winter. The park office can give you a complete list of campsites in the state forest, some of which are designated as primitive and can be reached only on foot or by canoe. You can reserve campsites online.
The neighboring 1826 Atsion Mansion of Philadelphia ironmaster Samuel Richards, restored to former glory, is an added bonus.