Are you going alone with just you and your 2 daughters? If you have someone else in your party, I would keep the Ohana reservation for 2 and have the girls go downstairs and eat at Capt Cooks, or even make them a reservation at Konas for the same time and they can eat something off the really good kids menu. My boys loved the independence of dining "alone" even though I was right near by. Works out well, especially on the dining plan. They just scan their bands and I always told them to use the suggested tip..so their math skills didnt need to be sharp on vacation! If youre not on the dining plan, they can still scan the band to charge to your room, if youre staying on property. 11 and 13 are great ages to give it a try. If they finish early, they can wait in the big lobby (craft corner/movie) or give them a small spending limit and let them shop in the gift shops on their own too.