Last trip down we bought empty sticker books for the kids (DD was 5 and DS was 15 months) and would hand out a page of stickers every so often. DS wasn't into putting the stickers in the book at that point, but he loved being able to play with the Buzz ones once DD got them off the page for him. He's really into doing it all by himself now, so maybe yours would be too. In the past I've also made Disney coloring books. Magna Doodles are great, too. We drive to my parents in Houston every time school is out, so the kiddos are used to 7+ hour car trips. I think I've got a whole closet full of tried entertainment things, but my brain is not coming up with more than this today.
Where are you planning to stop for the night? We've stayed in Shreveport, Nachidoces (know that one's spelled wrong), Gulfport, Pensacola and Tallahassee over the years, so if you need a hotel recommendation (or warning

) let me know.
We always stopped to eat at either McDonald's or Burger King..something with an indoor playground. I think I know where all the playgrounds are from here to Orlando

. We'd let the kids play while we ate and then would do a happy meal to go when the kids had run off some energy.
DH is already stressing about the airport. We can't decide whether or not to take the stroller and carseat. I'm sure we'll be debating that one up until we walk out the door.
