If you really want the most out of your trip, plan plan plan. Hope you are staying at a Disney resort ?!? that way you are able to enjoy the ''Extra Magic hours''. Plan to go to the parks that opens early or stay open later for those who stays on site. Plus when you stay on site you get the fast pass and thats a must. Having Park-Hoper Tickets get really handy so you can start your day here, go rest and go back there. Have also the dinning plan if possible, so much easier and cheaper for meals and snacks. When you get to the Parks, grab the Park schedule to see the different show, the character spots, the parades and the fireworks. You need at least 2 days to Magic Kingdom to really enjoy it, perhaps 2 days at Epcot... not my fav, Animal Kingdom is only a daytime thing so you can go to another park at night or rest at the Hotel or even go to Downtown Disney, I went to Hollywood Studios 2 days as well to see all the shows and attractions.

I did not know about special tours man now I will have to go back to visit the under Disney for sure !

If you have girls, get them the Disney Princess experience at the Bibbidi Bobiddi Boutique at Cinderella Castle, it is so worth it especially before 8 years old I think...

Definitely go to Universal Studios if you can... but thats like a 3 days trip on its own because you have 2 parks to visit (2 days at Adventure Island and 1 at Universal). I stayed on site there as well, that way you get special treats, early access to Harry Potter and the fast pass to rides is a must

Of course you will be exhausted after your trip but man will you have tones of neverending memories