Camping bingo game for the kids. Lots of other great ideas on this site. I would have the boys work in teams and use a digital camera to document their finds to follow the principles of Leave No Trace. mh
When working with a Curves Adjustment layer to color correct an image, you may sometimes inadvertently make the image darker (or lighter). To apply your color correction without affecting the tonal values of the image, set the Curves Adjustment layer's Blending Mode to Color.