I'm a big fan of the breakfast at 'Ohana. It's your standard breakfast fare (eggs, bacon, sausage, potatoes, fruit, Mickey waffles), but it's all quite tasty. Character interaction is decent and kids (and daring adults) get to participate in a parades with the characters around the room. Down side is that it gets very loud, but the interactions between Lilo and Stitch are hilarious!
I was very disappointed in the dinner. I was really looking forward to it, but the food was just not impressive. A lot of quantity, but I was expecting more quality (from a Disney restaurant). I thought the noodles were your typical cheap Chinese lo mein and the meats were all a little chewy. The salad was good and I enjoyed the wings, particularly with the various dipping sauces. And the bread pudding with Bananas Foster sauce was delicious, but really: how can you go wrong with that??
Other suggestions:
Breakfast - 1900 Park Fare for Character Breakfast. Though it repeats Tigger and Pooh, Alice in Wonderland and Mary Poppins always put on a good show. Since they're face characters, they tend to spend a lot more time interacting (making for more memories!). The food selection is also more varied and all very good.
Kona Cafe for a la carte breakfast. The Tonga Toast...
Dinner - Kona Cafe. Everything I've had has been very good, and the macadamia nut butter is amazing
Cape May Cafe. If you're into seafood, the buffet is really good. If you're not a seafood lover, there are still several options available, but it may not be worth the trip.