I had a dream last night that we reached the airport and i had left all the tickets for our whole world adventure at home and i couldnt reach anyone to get them to bring them down to us.
In that light, however. To both of you. If you have your tickets already, make copies of the backs of them now. Put that bunch of paper into a suitcase or carry-on immediately. Then pack the tickets, also immediately, in ANOTHER part of your luggage.
We were driving to CA for our first big DLR trip and I had our packet glued to me. Went into a store in the mall to get a new cord for the mini DVD player, left, got a few more miles down the road, and...I had left that entire packet at Radio Shack. Drove like crazy to get back, I RAN through the mall (not pretty!), and it was sitting right there. As I grabbed it and looked through it, I heard the clerk on the phone with a credit card company, trying to ascertain if the person in front of him trying to use a credit card was authorized to use it. So a possibly sneaky person was right there with my packet, which included 3 5 day tickets and all my info!
Augh
Make copies of those tickets NOW, pack them separately.
Other than that, camera, memory cards and/or film, underwear, bag for the parks (possibly a bum bag, if that's the phrase you use and I think it is). Enough clothes or enough money to buy new whatever-you-forgot. Passports.