We used a small purse sized photo album and index cards. You could fit more than one index car into the pages (sort of layering them) if you want to have more choices than you have pages for. Just pull out the card that is approprate for the park. Or you could have more than one book - general stuff that is in each book in the same places consistently and pages that have to do with the rides at each park.
Lots of pictures on the internet (which there weren't when I made our last book - we only had pamphlets to use for pcitures).