Look up your local hackerspace, there's an index on hackerspaces.org. These are facilities where you go to do physical hacking (wood working, metal, electronics, etc). Typically they are $50 a month or so, plus any supplies you use. Most of the classes they offer are free plus materials cost. I'd hang out at one all day if I had time.
Also, look at taking up a musical instrument (and studying music in general). Keep in mind this involves more than just memorizing the movements need to play a particular instrument -- there is a lot of theory to get involved in. Once you get through some initial lessons (I prefer piano myself, guitar may be a good choice also), you can explore multiple paths -- either playing straight off of sheet music, or playing from lead sheets / fake books (which gives you the basic structure of a song, and you improvise from there). Something like piano takes a good amount of time dedication, and almost requires one to not be employed full time.
Take up an activity that requires contact with others, to keep up the social aspects of your life. Maybe join a community organization, or get involved in local politics. It is important to socialize so that you don't get stuck in a rut so to speak.