I am a DON in a correctional facility. I believe that you are wise to keep your hand in acute care to the extent that you can, to keep your skills polished. Correctional nurses perform a wide variety of tasks, but the volume and distribution of tasks varies widely depending upon the facility.
Correctional nurses must have strong physical assessment skills, because inmates are notorious manipulators who exaggerate and fabricate symptoms for personal gain. That will serve you well in any area you choose to go into later.