My husband and I just got back from our honeymoon on Maui, and Ono Tacos was probably our favorite place that we ate at. It's so good, we ate there three times during our trip. While we sat and ate we noticed a lot of people coming in also mentioned this was their second, third, etc. time to Ono Tacos while on their trip.
It's just good, authentic Mexican food. Prices are pretty reasonable for Maui, and the portions are huge. We tried the fish tacos (huge chunks of Ono - so good!), the carne asada burrito, the carne asada & shrimp burrito, and the carne asada tacos. Everything was excellent but our favorite was the steak & shrimp burrito. Their beans and rice are also very yummy.
Definitely go here, you won't regret it!