A few practical things:
Small roll of gaffers tape
A few safety pins
Some twist ties (can keep a button on, use to hold some keys, etc)
Ziplock bags in various sizes ( can keep food, money, photo disks, hand soap, tea bags, etc in them)
Some throw away wash cloths ( buy at Walmart or Dollar Store)
If you have any perscription meds ( a photo copy of your prescriptions) Same with your glasses prescription. Make and take a photo copy of it.
Extra pair of reading glasses if you need them
Mole skin to prevent blisters
Extra pen or pencil
Plastic door stop
Lastly, a sense of adventure combined with the patience of a saint and a respect for others!
Have a wonderful trip!!!!