I would get the meal deal! It is great... you get an entree, a large drink with the entree, a bottled drink (soda or water), and icecream or popcorn, all for 11.99... when we added up everything for our family of 3 (one child under 10), we saved about $18 this way!).
Our favorite places to eat are Tusker House and Flametree BBQ. I have to give the edge, though to Tusker House, especially since it is air conditioned. It does stop serving around 3:30 pm, though, so you might want to get there to eat around 2:30 or 3...check the times when you enter the park. The food is DELICIOUS and filling. I had the Balsalmic Chicken Salad, and DH had the Chicken Platter, which came with green beans and mashed potatoes. Both were DELICIOUS! DD had the mac and cheese, which was tasty, and helped DH with his green beans and chicken (that platter is huge, and normally would cost you about $9 by itself.
You can get your vouchers for the meal deal at any of the counterservice restaurants within AK. It is definitely the way to go. We will never leave AK to eat again!