THE CACHE IS NOT LOCATED AT THE GIVEN COORDINATES. This cache is named and after and dedicated the park's namesake: Martin Luther King Jr. The final cache is hidden not far from the given coords, which is the parking area. To find the coords, you will have to do a little research about Martin Luther King Jr. The final coords are:
N 39 03.AAB
W 076 58.CAD
A= The last digit of the year Martin Luther King Jr. gave his "I Have a Dream" speech.
B= The number of siblings Martin Luther King Jr. had.
C= The last digit of the year Martin Luther King Jr. died.
D= How many years the March on Washington (lead by King) lasted.
The final cache is a small organe container. WATCH OUT: The vines near the GZ may look fun and swingable, but they are poison ivy. I have first hand experience, DON'T TOUCH THEM! Please replace cache exactly as you found out. This is a muggle prone park. Use stealth! Happy Hunting!
You can check your answers for this puzzle on Geochecker.com.
*****FTF GOES TO ZORROBARNES!*****