For those of you outside the USA (not USA citizens) wanting to WWOOF in the USA / Hawaii, obtaining the correct visa is your responsibility. WWOOFing is not paid work and will not help you obtain a work visa or work permit. WWOOFing in an educational and cultural experience not a work opportunity. If your intentions with WWOOFing are to learn more about organic farming in Hawaii, please explain to immigration that you are here to learn more about the United States sustainable and organic farming movement. Most people who enter the US with a tourist or visitors visa, and clearly communicate these intentions to immigration, are allowed in without a problem. If your main purpose is to just volunteer in exchange for room and board, than you will need a work Visa. If you say that you are coming to work or volunteer on a farm, and you don't have a work visa, they most likely WILL NOT LET YOU ENTER THE USA / HAWAII. We are not responsible for any problems you may experience with immigration, please make sure you understand the laws and clearly communicate your intentions.