Another area to really cut costs in on souvenirs. I would suggest telling your girls that mommy/daddy will buy them one souvenir (or whatever you decide is acceptable) that they can choose. Then, have them just browse during the first half of your vacation. When our kids were little we always came back with way more stuff than they needed and always regretted it. By taking their focus off of buying things and putting it onto other areas we were able to save quite a bit.
As the previous poster suggested, we also save quite a bit on meals. We always have breakfast in our villa, except for one character breakfast. We eat sit-down meals for lunch, when it's cheaper, but we don't do sit-down every day. I'd also suggest having your kids share a meal if they aren't big eaters. You can always order more, but it really stinks to pay for food that ends up being uneaten.
We also bring our own snacks. We bring small packs of crackers, pretzels, Welch's fruit snacks, etc. Each of our kids picked their snack for the day each morning and could have it when he/she wanted it. On occasion we would buy a special park treat, but it wasn't every day. Now that our kids are older they carry their own snacks but we still bring our own. It really adds up to a big savings.
Have a great time!
