I've eaten at the Kona Inn many many times. There are 2 venues. The Grill on the north and the full service restaurant on the south side.
This review is for the Grill side.
The service was great and the setting awesome. I had the french dip and it was just ok. I tried my son's fish and chip it was good. My father had the coconut shrimp and he loved it. My mother had a cobb salad and she loved that.
It's fully priced but you're seated in a really beautiful location that's great for families w children as it's got a big sea side lawn where kids can play while parents relax, watch and enjoy.