Splendid China closed at the end of 2003 :(
I love World Showcase at Epcot, Fantasmic at MGM and Discovery cove, but make sure you add in time to shop (the christmas shop at Downtown Disney is great) and time to rest. Before going to Busch Gardens (or any of the parks for that matter) check out the height restrictions on the rides on the parks website (www.buschgardens.com), you do not want to disappiont your kids if they can not go on all the rides that they can see.
Don't do to much - you will not be able to see it all and you will want to come back again.
Have a great time!