My advice is to take advantage of the Disney PhotoPass system. We kinda knew a little about it prior to going to WDW. They take your picture and then scan a card and give it to you. Then every time that you have your picture taken in any of the parks you just give them your card and they will scan it and give it back. At the end of your trip all of your pictures will be connected and you can order them once you get back home instead of lugging them through each of the parks.
For $99.00 you can buy the rights to all of the pictures that they take of you at WDW on a PhotoPass CD. I know it sounds like a lot of money but I bought it and think that it will be well worth my money.
Once we figured out that we would be buying the CD we stopped at almost every photograher to get our picture taken. Some of them were just doing silly things in front of the castle, spaceship earth, hat, or tree. Now I can just take it to Wal-Mart and have pictures made.
Have Fun!