Mine should obviously be to consult in my field (environmental science), which pays very well. My going rate would be around $175 per billable hour, or more. Many of my peers actually earn more money as consultants after they retire (on top of their pension) than they did when they worked full time. However, I have no interest whatsoever to do anything remotely connected to this kind of work. Ever again.
Where I plan to spend most of the year (6-8 months), I will probably look for a part-time gig to walk or board dogs, house-sitting, haul junk to the dump and do odd non-specialized repair jobs, yard cleaning and general labour, grocery store clerk, etc. Substitute teacher has some potential and pays relatively well but I am not sure I feel like spending a lot of time in a classroom with turbulent kids. We plan to spend our winter months overseas and I will definitely teach or tutor English, French or Spanish as a Second Language, or work as a SCUBA divemaster in a dive resort, both part-time.