This spell opens locked objects, but you can probably find the cache without resorting to magic. This park is so lush, it feels as though if you stand for a bit, you'll find moss and ferns growing on you. This preform is right beside the trail, by an ancient log, under a stone; if you parked on Leda Rd or Parkheights, cache is on the left side of the trail. The satellites are tough to pin down here, so I trust the detailed hints will be helpful. Enjoy the trail.