1. Go to the park at the coordinates.
2. Find the tallest thing there.
3. Find the four letters under it.
5. Add the value of the four letters. (A=1. z=26) You should come up with a 2 digit number, xx.
6. Add that 2 digit number to the last three digits of the North and West coordinate in step 7.
7. N 36 48.338 W 114 08.469 (i.e. 338 + xx = abc, and 469 + xx = xyz)
8. The final will be at N 36 48.abc W 114 08.xyz
9. If you did all that right, bc - yz = 69. If not, check your work.
10. If you did it right, go find it.
11. Once you find it, sign it, replace it safe from the elements, log it, then revel in your coolness.