Mechanics are people who enjoy working on cars; and beyond that, cars provide lots of space to tinker --- I remember being inspired by old Mother Earth News articles on converting your pickup to be wood-burning, or vegetable-oil-burning, or any sort of alternative fuel. Farming/gardening is a great way to play with your kids, and make a little money on the side too; the money is likely to not be significant, but the pleasure at making money from the work of your hands is personally palpable, since I normally am a knowledge-worker.