We have been to Disney world with our 3 girls ages 7,5, and 3 over 6 times. We are also planning another trip in March and will be taking our girls and our new baby boy who will be 6 months. One suggestion is get a house with a pool. You can rent a property with 4 bedrooms 3 baths and a pool for between 600-800 dollars (way cheaper and nicer than having small kids in a hotel room) Here is an email of a couple I have used 3 times to rent properties and they were great ____@____.com
I have SOOO many helpful tips I can't even list them all. If you decide on Disneyworld, which I have been told by MANY people is much better that Disneyland feel free to contact me and I would be happy to help you out!