Hawaii is not a generic mainland pig-keeping location. Care changes between wet windward areas, drier leeward areas, cooler uplands, steep parcels, and small county-zoned properties.
Match paddocks, shelter, water systems, fencing, feed storage, quarantine, and parasite routines to the island microclimate where the pigs will actually live.
Main planning pressure: Humidity, heavy rain, mud, parasites, feed cost and storage, transport/import rules, feral pig contact, loose dogs, county restrictions, and tropical storms.