A holiday! A day out!
10GB of memory card, 2 camera batteries, camera, tripod, lunch and flask should be all that's needed to take a few shots of a waterfall. I took some shots on long exposure for motion blur and some on short to catch droplets, and then some just to catch a nice view.
We went on a 4.5 mile walk with a very seep gradient, in fact it was almost a 2 mile concrete staircase up one valley and 2 miles of staircase down the next. Non-photographers can do this in 4 hours. We took 6. Believe me that is quite long enough away from a toilet!
I have come away with 355 photos, a very large bump on my forehead, scratched glasses, but unharmed camera!
Chippy's shot is here.
A few more on Flickr.