My family and I usually visit Orlando on November or December each year, mostly cause we like the cold weather more than the hot summer...
As for things you should not miss:
Islands of Adventure: Try to go around the park and hit all the coasters. Given that you should not hit big lines, you should be able to do this pretty easy...
Universal Studios:
The Mummy is a nice fun ride.
Earthquake is nice also, although smaller kids tend to get very scared.
Jimmy Neutron's ride is fun, and even adults will like it.
The Shrek 4D show is very nice, specially if you liked the movies.
The Animal Plannet show is skipped by many; but I for one believe you must watch this show... very entertaining.. .
Disney:
Since you are going to stay inside Disney, make sure you use their bus transportation. It does help, and you save a bunch on parking...
In addition, watch for special offers on the Resort's caffeteria (for example, on Pop Century there are refillable Soda mugs)...
Since you are on a Disney resort, make sure you also take advantage of the priority seating on the restaurants... You must go to Plannet Hollywood, have their chicken crunch apetizer, and eat some ribs...
watch out for the extended hours on Disney parks... Always try to take advantage of the one hour early entrance to a park... It is way better than the two extra hours you get at night...
I'll see what else I come up with...
