I usually buy one on site, they sell them in pretty much every big merchandise stores and in the hotel gift shops. They have: #1:the generic blue, Mickey & characters on the front, plain empty pages inside #2 & 3

rincesses or Tinkerbell on the front with little designs inside (princess book is pink, tink is blue) with photo slots in it, this one's a little more pricey and doesn't have as many pages. #3: a super big one full of mini princess stories with places for them to sign & pictures, this ones even more pricey. I usually just go with the plain one, it's cheapest and has the most pages. I say go with whatever the kids want when you get there, they can pick their own, and have some fun with it! (also note that the characters sign best with the thicker pens, easier for the hands to hold!)