I would only do Boma if you are going to be at AK that day and go staight from the park. It's really good, but transportation from WL to AKL would be a pain. Much easier to get to Poly and O'hana is very good and lots of fun for the kids. I love the food at Kona as well, but O'hana has such a great family theme and feel. The activities for the kids are fun, as long as they will get up and do them. I have one who will and one who won't.
Every one loves the bread pudding!!