I totally recommend the Hawaii Food Tours "Hole in the Wall" tour - and I recommend doing it early on in your trip. We did this tour our first full day in Hawaii, and it allowed us to visit a couple of the places again throughout our visit.
Matthew and Keira are wonderful hosts, and their local knowledge - not just about food - made the day even better. These two know their food, and they know Hawaii, and they know how to enable you to enjoy it to the fullest!
When researching for this trip, I decided to do this food tour over a luau - and boy am I glad I did.
Do it - you won't regret it one bit! It was definitely a highlight of our trip and I would do it again in a heartbeat!