The letterbox is NOT at the listed coordinates
(though they are listed in the final location for those so inclined)
This is a rather new Lake Forest Park, open dawn to dusk. The listed coordinates are for one of the two gates and you can park along the road here. Once you enter the park, you will see a boulder-lined path. Also, you should see a large stone feature about 150' away. This is where you need to go. It was once a large outdoor fireplace and such. There are several doors that may be open or closed. The cache title tells you which one to choose. You may have to take a knee to look inside, since it is low and a flashlight may help. Look inside and up. Magnetic. Large silver and black pill container.
Take time to stroll the area. McAleer Creek runs nearby. There is a picnic bench and a couple of cool, large old trees. Please leave the stamp and stamper in the cache.