Surveying can be some worthwhile science gigwork.
Years ago I did some work with a research institute that was counting shellfish populations that was almost exactly this. A few weeks for a few summers hiking tidal zones. Most of the crews were college students, but not as interns or as a part of any programs. Some were just locals looking for some work.
I just don’t think a lot of that work is advertised outside colleges.








squints
Civ… 4?