Once a popular food truck, now a no-frills, sit-down restaurant in Haleiwa Town Center, Opal Thai serves the best Thai food on the island. My favorites are the crab stir-fried noodles, duck curry, and fried tofu with garlic sauce and fried basil leaves. But it may be hard for you to order; owner Opel Sirichandhra likes you to leave the dishes up to him, asking only for your spice preference and favorite Thai dishes as a guide.