Well, the latest puzzle I am working on is ending traffic congestion completely. There is no known notion or cookbook capable of easily solving it, without significant costs. Therefore, this can only be solved by the most logical of all men. One who has an economist's mindset for cost-benefit analysis, one with an enormous visuo-spatial intellect to see all the variations in the economy of movement based on different rules, and one with taste for both linear and non-linear models. I have set myself this task. Every day I think about how many billions of dollars are consumed as people crawl in traffic, and how these resources could be allocated to making society more productive. That is my hobbie. The solution I put forth in a paper I plan to get published is congestion tolls and public transit subsidies. Though even as I say this I know there are deeper answers that will involve fusing together geometry (for all the spatial patterns); quantum physics and chaos theory (using a non-linear model to explain how one accident can cause complete gridlock, even long after it is cleared); logic, which I use to solve every known problem; economics; and of course the politics of it.
In addition, I'm working towards being a logician in my spare time. I also play chess, the saxophone, and I enjoy watching movies though I haven't watched tv in two years as I am against it in principle.
