Great - driving your own vehicle can make this really quick, depending on where you park. If you're parked at the port itself its really easy. Walk over to the garage and head out. If you're using an off-site parking lot then its a little longer because of waiting for a shuttle. You can get off the ship as soon as its cleared by customs - probably about 7:30. You could be on the road to WDW about 8:00 - 8:30 and its only an hour to WDW so you'll have lots of park time that day.