I can throw out a few odder ones

LOL!
Camp nursing was a blast for me, and very autonomous!
Occupational nursing in certain companies that have them (some companies have a nurse on staff during business hours to handle high risk injuries, drug screens, immunization and tiders...).
Drug reps hire nurses to talk about their products.
Triage Nursing in various areas, including insurance.
Working in insurance companies handling disputes or coverage for certain things.
Forensic nursing!
Nursing Law and being a special witness for certain cases.
And I have known some nurses that have started up companies after burn out or retirement for nursing type items like a store for scrubs, nursing recruiting and agencies, taking in a elderly patient at home to care for them, and even...Vet!