Scout camps are usually good places to start because they are easily accessible to all troops and many people can benefit from the work that will be required to complete the map. The best maps are offset printed in 5 colors , but computer generated prints are becoming more adequate as the technology develops. If the organizers have someone that is interested in producing a color map of the area to be used, there are a couple of CAD programs available. A good color map will involve several steps. Two square kilometers is often enough for an event, depending on the complexity of the terrain, but more area may be needed in areas with few mappable features.
Most groups choose to start with a black and white map which can be done very cheaply.