I used to work at Disney World. Just be as nice as possible to the people that work there. They can either help you a lot, or ruin your fuckin' vacation. Be sure to tell at least 3 employees your son/daughter spilled something/puked on their shirt, they'll write you a ticket for a free shirt. I used to write up free stuff all the time for people.
Magic Kingdom has a bomb ass fireworks show every night called Wishes. Get yourself a fastpass for Space Mountain first thing when you show up to that mfkr. Be sure to see the 3 'o clock parade. Get a fast pass for Splash Mountain, and sit up front (back gets most of the water). Buzz Lightyear can be fun, the Monsters Inc. interactive show is pretty cool. Stitch's Great Escape is neat, but if your kids cry and get scared easy just skip it. Don't go speedway, its a waste of time. For the love of god don't stand in line for hour so you can go on the Pirates of the Caribbean "ride", its so fucking boring. Skip COP, the song will drive you crazy. Tomorrowland Transit Authority is a great ride to rest on, you can just keep going and going until you feel like walking again.
Animal Kingdom- be sure to get your fastpass for the Yeti ass rollercoaster a.s.a.p. Its a lot of fun. Don't miss the Lion King show they do a few times a day. There's also these crazy Kenyan guys who jump through each other's torso's and stand on each other's heads until they're 28 feet tall who put on a show a few times a day. Get a Jungle Cruise fastpass as well.
Epcot- get your Soaring fastpass as soon as you show up. Ride Test Track for certain. Find a damn babysitter and take your old lady there at night- drink around the world and watch the fireworks show with her, it can be romantic- guaranteed sex when you get back to the hotel.
There's also some more fun stuff in Epcot and Disney's Hollywood Studios (fastpass Rockin' Rollercoaster and Tower of Terror soon as you show up) but I gotta bounce out so I don't have time to keep going on. You're going at a pretty good time of year though, right before spring break. Shouldn't be too crowded. There's some fine fuckin' women no matter where you're at, so the eye candy should keep you from getting too bored.
My real advice though is to say fuck Disney and go to Universal, they just opened the Harry Potter theme park inside their theme park and they have better rides.