How do you get to little lamplight in fallout 3

its on the western side of the map, in order to enter the town, you have to complete the quest at paradise falls where you rescue the kids, although there are other options. if your leaning towards more of the location on the map then head directly west from vault 101 you will eventually see fort bannister which will be infested with talon company mercs (don't get to close to them and don't engage in battle if your on a lower level) next travel north west but mostly west from there, you should see the classic little lamplight sign and a cave.