Set next to the picturesque Ladybower Reservoir. Trolls that live inside the mountain always leave spare keys hidden around so that if they lose theirs, they can still get in and don't turn to stone in the daylight! See if you can find their secret hiding place (Remember to leave the keys for the trolls). It is a small micro with a logbook and room for small trackables. No room for a pencil, so take a pen and tweezers!.
A good quick cache to find before heading on a walk around Ladybower or off up Win Hill