Track down Pretty Boy Lloyd, recover the stolen money, and make an... example of him

This quest is given to you by Louis Salvatore.

Lloyd is hiding out in the basement of the Desperado. It's possible to force him to take you to where he hid the money, make him dig (it's trapped), then throw the landmine in after him.

To avoid karma loss, an alternative method may work: follow Lloyd down, exit combat and sneak up on Lloyd, then use steal on him and plant dynamite/plastic explosives on him (two of either may be required, or weaken him with gunshots before sneaking). Be sure to sneak away to safety. Lloyd should blow up without any loss of karma on your part. Salvatore will still reward you for this.

Disposing of him will net you 500 experience points.

Return to Mr. Salvatore and give him the money. He'll pay you $500 and you'll gain 500 exp for completing the quest.