You can park at the posted location when school is not in session.
This is listed as being a 3 on the difficulty scale because of all the other caches you have to find in order to get this one.
In order to find this cache, you must find all 14 Osiris caches and the Isis cache. In each of these caches you will find a number of the coordinates for Horus.
N AB CD.E4G
W 1IJ KL. MNO