How to spend the last months of a CS postdoc usefully before leaving academia?
Perhaps your advisor has one or more students that could benefit from more mentoring than the advisor can supply?

Helping young graduate students learning to do research and write papers would be worth doing in its own right. If you are going on to an industry career mentoring junior programmers would be a valuable skill. It would be a different sort of experience to put on your resume when job hunting, not just more of the same.