8 Answers

Money Honey!  Sunscreen, water, a camera and a sense of humor... big time!

Plenty of money.

ME .AND MY AMERICAN  CREDIT CARD .

Like the answers above,lot's of money and a good pair of walking shoes.

A lightweight jacket, just in case. Sunglasses, for sure. Good walking shoes; swimsuit, camera, lots of loot, a tote bag that your wife can carry in her purse until you have purchases to put in it (They are usually $1; get a few). Patience, a sense of humor, the willingness to see the world through the eyes of a child for awhile.  Your ID and credit card. 
Oh, don't forget ASPIRIN 

Patience, understanding and be in No rush.  Plus all the above!!!

all of the above: When you get to your rooms, your daughters  will want to have something to do. Get fun workbook, a doodlebook, good colored pens, white, good quality drawing paper, sharpened colored pencils, their favorite music,

Me !  Pleeease?