i'm here ,too!!! ...but you already know that because you've helped me so immensely regarding the atlanta drive....
i usually dress the kids similarly (same weight of clothes, same level of coverage, same level of comfort, etc.), so i have packed somewhat coordinating clothes, for the most part.
my girls are identical, so it is really important for me that they have their "own" colors on while in the park (yellow or purple for one, and red or pink for the other). this way, in an emergency, i don't have to "think" about who is who (and at 2 1/2, they are already at the point where they will ignore me if i am calling out the wrong name, even if i am looking directly at me...which certainly seems fair!!)
as for other tips, i'm not sure i can help as mine are so much younger than yours, but i will post a trip report when i return....
(btw, not sure of you check on tc very often, but that was me asking about crying in hotel rooms!! i wanted to get an idea of how other MoMs handle it!)