I wwoofed in Hawaii last year. It was awesome. I was on the Big Island. There are tons of farms all over Hawaii that offer internships. Some are more vegan friendly than others obviously. The farm I was at was very supportive of my veganism and bought me all the food I could eat. Sometimes they would cook meals for me too. I stayed in an old RV and there were three other interns who stayed in a huge tent. I worked 25 hours per week in exchange for food, lodging, and knowledge. I would love to go back. It's beautiful over there and the weather is great. There are plenty of farms to choose from. I found mine at organicvolunteers.com.