In addition to the above -
Indi might enjoy pointing out any golden 50th "Hidden Mickeys" he sees around the park. Many are pretty easy to spot.
Gold ride vehicles - even if you don't get the golden Dumbo or Teacup, you can have a family photo in a gold one just outside the attraction. This goes for Pan and Toad as well.
Between the April Swanking and my brother's birthday, we won't be able to meet up with you.
Why the short notice trip? Sounds wonderfully impulsive! I'm sure you'll have a blast.