I believe to be a divemaster or guide, you need a special tour guide license and they don't give those out to any Joe Shmoe who wants one. A gringo moving here to be a fishing guide or divemaster, forget it. Its not going to happen...legally anyway. Property Managers just need a work permit or residency, same as a chef. But a chef will also need to get the ok from the health department.
If I'm wrong, someone please correct me.