We went to California Grill last year for Thanksgiving "Dinner" at 5:30 p.m. For two of us, we spent $107!!!!
They have a VERY imited menu that day, $45/dinner... I did get the turkey dinner and my daughter, who doesn't like turkey, ordered goat cheese ravioli, because that's the only other thing that appealed to her. I had ice water and she had a tiny glass of soda and one small glass of house champagne. The salad was gross, i don't know what they did to it, but I couldn't eat it, the goat cheese pizza appetizer was good once I scraped the hunks of goat cheese off...I think the server was getting very frustrated with me, because I didn't eat a lot of the appetizer/salad, & didn't order a lot of drinks, etc.
We did have a window table and could see the Castle changing colors... Me?? I was still hungry, and my daughter was starving, so off to the MK we went for some food.
Our limo driver told us on the way back to the airport on Sunday, that he had gone to an all you can eat buffet and it was great!! If we went again at Thanksgiving, I'd definitely do the buffet, that seems like that's the way to go...
We stayed at the Polynesian, but never made it to O'Hana's, so I can't even comment on their menu.... I believe there is a menu posted for Thanksgiving day dinners somewhere, but I can't remember where I found it last year when I was researching everything.
Good Luck in whatever you decide.