if you play, learning about/fixing guitars and pedals is something pretty interesting, you learn a lot about woodworking/wiring/soldering and finishing a product and having a nice good-as-new guitar/bass is really satisfying. (paging beelthazus about actual luthier work) Plus having a guitar you built or restored yourself is a cool talking point!
honestly learning to repair anything is really informative/helpful, and can teach you a lot. Find whatever interests you (PCs, instruments, electronics, furniture, appliances, etc.) and learning how to fix them can be fun and help you gain more in-depth knowledge about that particular thing