The track is easy to follow and easy for the kids, the final location, will be easy for an adult to retrieve with kids being left at the top, but will still be right near the cache. It is a small container with a logbook etc. Make sure you place it back in it's hiding spot, no need to force it back or it may disappear into the blackness behind the hiding spot.
You may like to continue down into the valley below, the track is not overly demanding, one section may be tricking for small kids though, just remember, you will have to return up the way you came, nothing really that taxing though.