I must admit that I found Duke's Waikiki good but not great the one time I've gone. I haven't tried the Hula grill in Waikiki. I very much enjoy the Maui and Kauai Duke's locations but my favorites are Leilani's Maui and Keoki's Paradise Kauai. I find Hula grill Maui hit or miss and I'm not sure if I've eaten at Kimo's. Of those Keoki's is my favorite. One hint, generally they will let you use the widely available discount of a free piece of Hula pie with the early bird specials. Another hint, Keoki's had Mint chocolate Hula pie in addition to the normal one last time we were there.
Hopefully
DVC will get with the program and expand it's holdings in HI.