Really good advice, Mylife. I like to imagine myself looking back from age 85 and thinking about what I might regret. I did that a few years ago and realized I still loved history (my major in 1960's college but I changed majors right before I graduated) so now I'm getting a second BA in it. It has literally changed my life.

I have to be careful though because I'm a big reader and that's not the same as "doing." There's a difference between knowing "about" something and knowing it for itself.