Knife
Snack bars (they'll come in handy, make sure they don't melt)
Flashlight
Cane or a good stick
Weapon of some kind (don't have it with you when you're a in a public area)
Painkillers (if you experience serious wounds)
Water bottles, no, lots of water bottles
First aid kit
Money (for situations)
Actinometer (for seeing how hot the sun is and for measuring radiation)