Jim,
Looks like our wise administrator gave you the info on Jersey, I'll see about filling in the blanks for a National Park Ranger. First the NPS has a variety of rangers that do a variety of jobs. As much as I would love to be one, I am not a backcountry ranger. My current position is Conservation Ranger at Independence Hall in Philadelphia. I care and help preserve thousands of objects and a group of buildings; these include Independence Hall, The Liberty Bell, first drafts of America's founding documents and many, many others. I have two history degrees; a B.A. and an M.A. in history, and a minor in wildlife management. To get a ranger job with NPS you need at least a Bachelors degree. I also have taken Leave No Trace classes, N.O.L.S. wilderness classes and a variety the Park service has sent me to. Two years ago the NPS sent me to northwestern Arizona were I got to hike and climb, along with taking great classes provided by super educators.
Some of the most sought after jobs are those involving backcountry work. Some of these are commisioned law enforcement jobs and others are interpretive jobs (which is what I am trying to get into). The Law Enforcement are just what they seem to be, patroling sites, making arrest, writing out permits, etc. The intepretive jobs give educational tours, backcountry lectures, write programs, and generally help with upkeep of sites.
The easiest way to get one, or any of these jobs, is to be willing to work just about anywhere. In not doing so, you narrow your field and make competition extremely tough. Use USA Jobs on the net, it is a listing of evry type of job the govt. offers. Please feel free to drop me a line with any questions, I would be more than happy to discuss any and all aspects of this work. As a last thought,your mechanic skills are definitely useful in the govt., we employ a variety of mechanics.
Joe~