Ask HN: What do you do with your time in between projects?

This goes out all the consultants, freelancers and project-based developers on HN.

I find myself with a nice little idle period coming up. I will be completing a project soon and it looks like the next job could start anytime in the next 2-8 weeks.

I'm curious, what do you guys do with free time like this? I guess most will do some travelling or reading or learn a new tech.

Personally I would like to start a profitable, self-sustaining side project but I don't suppose that is realistic in such a short period (2 weeks to 2 months).