Once you have the information you need, you search your foe's car for any munitions that could help with the assault. You find exactly what you didn't know you needed, despite a surprising lack of conventional firearms; there, nestled in the back seat, is a rocket propelled grenade launcher. You take the launcher and one of the heavy rockets and head over the the restaurant you were told to look for crime boss who wants you dead. Apparently he's there with several other criminal overlords, you should be able to cleanse a lot of evil with this RPG.
When you arrive, you can see a table of men sitting just inside the restaurant; even with no experience, this should be easy. It takes you several minutes to figure out how to load and fire, you eventually you manage to shoot and annihilate your targets. As you watch the fires burn, a large man with slicked back hair and a collared shirt emerges from another nearby diner to view the scene.
"Why'd you just blow them guys up?" he asks, puzzled.
You explain, "Well, one of the crime bosses over there was trying to have me killed."
"Oh, man," the guy replies, "that's really bad news."
With a smirk you say, "Bad news for them."
"No," he says, "I meant bad news for you; you hit the wrong diner." You look over at him and see he's holding a gun. Several other armed men have come out from this other diner, too. You're allowed a brief moment of existential crisis for the innocent lives and the business you wiped out, then they start shooting you.