Go to the posted coordinates and shine your flashlight and find the first reflector. All dots are chest to head high. Follow the reflectors until you come to a tree that has 2 reflectors side by side. This is where the special tool comes in. Stand in front of the 2 reflectors and turn your flashlight off. Then turn on your "special light" and the spirits will reveal what you have to do to get the cache. If you have any problems finding the final container flip on your "special light" again and help may come.
You will need a good flashlight,and a "special light". and spare batteries not a bad idea. Not good to run out of light in the woods.
The reason for the 3 terrain? You are in the woods, at night. There is a small ditch to cross at the beginning. It's a small ditch with a little water in it at times. Rubber boots or water proof hiking shoes keep the feet dry. The woods are fairly open and flat with easy walking. Be sure to have the parking coords to get yourself out in case you get turned around; but this shouldn't be a problem.
Most of all - Have Fun!