It would probably help to take the ANCC specialty certification exam
http://www.nursecredentialing.org/ . Recent trainings in Chemical Dependency, Suicide Assessment, Cognitive-Behavioral Therapy, etc. I don't think Criminal Justice would help unless you want to work in the criminal justice system.
With your experience, I think you'll have no problem getting a good job even if you do nothing extra to prepare. So if you decide instead you would rather goof off and enjoy the Spring, go right ahead!