I read you about your Disney dilemma earlier and wasn't quite sure what to tell you. But now after reading Optimist's post, I think going on your own while leaving your H with the option of joining you sounds like the way to go.
He seems to have problems making up his mind about most things these days anyway. Providing him with the option of joining you may take the pressure off of him.
Just make sure that you don't have any expectations and have a good time with the kids. And yes, I vote for the convertible! I am all for PMA boosters!