Just a side note, if you have kids in your party, they can't take the Keys tour a previous poster mentioned. But I've taken the tour and it's great, I highly recomend it! In fact I'm doing it again on this trip!
But yes, you can use both wishes on charactor meals, if you wish. But most of the charactor meals are buffets, I think, so it's a lot of food. If you are a light eater, it may not be the best use of your wish. You may just want to use one wish per day for a meal, and the other wish for something else like merchandise, tours, or other recreation. But that's the fun of the program, you can use it for anything you want!