Personally, I headed back to college a few years ago, and am almost finished with my engineering degree.
I've always said that if I could do it all over again, I would get licensed as a plumber and electrician. Like someone mentioned earlier, if you're honest and hard working, the skies the limit with technical trades!
However, male nurses are in high demand, and can pull down a pretty penny!!!
Good luck in whatever you do, and let us know which road you take.
Ben