The cache is not at the posted coordinates, but you might be able to park there.
Go to the 10 waypoints shown on the map. At each one you will find either a small wooden sign or a slab of concrete. Write down the first five words and the last digit that appear on each sign. Measure the sizes of the concrete slabs and note their coordinates.
Calculate the center of mass of the "system" of concrete slabs, assuming all the slabs are of equal thickness. Alphabetize the text from the signs and use the digits, in that order, to complete the following sentence:
From the centroid, walk at bearing of _ _ _ degrees from true north for _ _ _ meters.
The cache is about the size of a roll of quarters and contains a logbook and a pencil stub, but no trading items. Please be discrete. This park can get very busy.