Try looking at Craig's List for jobs and the online versions of the newspapers:
West Hawaii Today (Kona paper) -
West Hawaii Today
Hawaii Tribune Herald (Hilo paper) -
Hawaii Tribune-Herald :: Hilo, Hawaii > Front
Basically, the way most folks get by around here is to live as cheaply as possible (usually more than one wage earner per household) and have a few ways of making side money as well. I hatch out chicken and duck eggs and sell the chicks and ducklings. It provides a bit of extra cash as well as pays for the chicken feed. We also have eggs and the occasional chicken to eat. My neighbor does odd jobs and mows lawns. Another neighbor does the occasional music gig. Some other neighbors grow plants for the Farmer's Market. One other neighbor repairs small engines and another one does hair styling. Hmm, we have a busy neighborhood, I never noticed how much little side business was happening. Another neighbor trains horses while another one makes sweet bread and sells it through the neighborhood. Some of this is barter and trade, too. Hair cut in exchange for sweet bread sorta things.
The biggest barrier to surviving out here is the high cost of living, especially if one wants to live like folks do on the mainland. Rent a room instead of a whole house, drive an old beach car instead of a leased or shiny new one, wear comfortable clothes that aren't expensive, find entertainment that is free or inexpensive (hiking, chatting with the neighbors, going to the beach), prepare foods at home from basic ingredients and produce as many of those ingredients yourself. Then, instead of having to find a full time high paid job to pay for all the stuff you thought you needed, a lesser paying job will cover the bills.