Kombucha brewing, espresso machine hacking, chicken ranching, beekeeping, cigar box ukes – the joy of making cool stuff yourself. The successes were the least interesting bits; his repeated failures are far more instructive and fun to read about. Best blurb:

“What Mark Frauenfelder knows is that making a ukulele out of a cigar box is not just fun (and finally a good use for your thousands of old cigar boxes), it’s a way of restringing and retuning your whole life. Buy this book, read it, and then maybe make it into a clarinet. I bet you can!”
– John Hodgman