The Tokyo Disney Resort part of my trip will be April 15 - April 18, departing the 19th! That should give me ONE DAY to ride it. For the moment I think I'm pretty darn lucky, unless that "dates subject to change" thing comes into play. From what I've heard here though, the dates are usually pretty firm.
The only other thing that worries me is...Journey to the Center of the Earth isn't showing up as a DisneySea closure yet and the list goes up to July 21. It has typically been a May-June closure hasn't it?