There may be a better and cheaper solution, but it's just plain easy to use the Disney transfers!
The one time we didn't (flew to Melbourne instead of Orlando) our ground transportation reservation got "lost" and we were really lucky that they had a driver free to get us to the ship in plenty of time.
Karen
Wonder 11/01
Magic 3/02
Magic 11/02
Carnival Destiny (don't ask) 12/03
Booked on Magic Eastern Panama Canal 8/05