In a pinch I have sharpened knives on the bottom of a ceramic mug (the unglazed bit). Have done this in holiday apartments when all the knives are hopeless, agree nothing worse than a dull knife.I never travel without my work leatherman and duct tape....comes in very handy wrapping stuff to take home.
If I go to nz, I'll take my chef and petty knife over....love to cook the mussels and I slice up my own sashimi. Cannot stand a dull knife....
i L O V E ziploc bags. I use them every trip. I probably have a 100 of them at home in a plastic box, ready for our next trip, and the one after that, etc.If you have bulk stuff, like I've been carrying, make sure you seal it (maybe double) in ziploc bags in checked bags.
Took all the way to page 6 for someone to mention sunglasses.Sunglasses. I always think I'll get some in duty free on the way over, then don't get enough shopping time, and spend rest of trip squinting.