Originally Posted by trig009
I already have the basics covered: Camera, extra SD/CF cards, extra batteries.
For the basics, don't forget things like a water bottle, emergency food supply, and some comfortable way to carry your gear (whatever works for you).
What nathancarter says on the flash is good advice too. There are diffusers you can find online but I've had the best luck just building one using craft foam and velcro. If you look at this photo: http://accessaccess.deviantart.com/#/d5k9w89
it's #6 in the photo, it folds flat for storage, you can get the necessary pieces for less than $10. or so at a Michaels.