Brahmin Pens Clearing.
It's the toughest and the most unforgiving job in the entire wasteland. You think that hunting super muties is hard? How 'bout you try to survive in a brahmin pen for longer than 10 seconds. I dare you... I double dare you, mother******!
You can earn caps by shoveling crap in: Hub, Junktown, Vault City and Shady Sands. Just make sure you ask for a shovel first. After that just use it on every piece of crap you see.
50 experience for each "target".
20 caps for each "target".