I've never been to Sanaa, and it's been SOOOOO long since I've been to Kona (once, at least 10 years ago, for dinner, but would LOVE to go for breakfast, and try their press pot!!).
So - of Ohana and Boma, I think I prefer Boma for the range of foods, being able to get what I want and as much as I want of that range, and being able to experience the majesty of AKL and the animals before and after!
And if Tusker House (last time I did it was before the characters), Crystal Palace, and Biergarten are still all 1 credit, I've always foud them to be personal "must do's" as well. And I also enjoy Cape May (for either breakfast or dinner) if that's still 1 credit - and I don't even eat any seafood except fried or shrimp cocktail!!
Great question, by the way!