During college I worked in a plastic fabrication facility - it was like a wood shop with saws and routers, no giant moldingg achines. Learned an interesting trade that I could easily fall b ack on if developing gets old. Plus going to work was like going to the gym except they paid me.

My suggestion would to find a part time job that has you active physically and mentally. Tradesmen / craftsmen are always looking for some reliable help even if you need to be trained. Go learn cheese making or how to run a printing press.