Originally Posted by
AvEn
(in which I would land back at my point of origin, of course, so as not to step outside the limitations of my commercial pilot privileges.)
I do not understand what you mean here. As a commercial pilot you can land at other airports and overnight there.
At any rate, welcome to the forum! Becoming a CFI is a great weekend job, if you decided to go that route. You would also become a much more proficient pilot. Other than that, you might be able to find a weekend traffic watch, pipeline, fish spotting, banner towing, or skydiving gig.