Use previously taken photos of the local area and get the Cubs to find and mark them on a map
12 photos already taken - 1 set of each six
map of local area
Give each six a sheet of paper with a selection of photos on it. Also give them a map of the local area. Ideally position the photos so they follow a trail around the town (or whatever area you are using). They have to mark the numbers of their copy of the map.
Try and make more than one route, so they are not all following each other.
Remember safety ratios