Come to the greatest view in the park and play this short wherigo and then grab the cache on your way out. It is not in the park but not in the park. It is just outside the South Entrance going towards Oakhurst go here to download the cartridge:
http://www.wherigo.com/cartridge/details.aspx?CGUID=1cbe07be-4112-4ed4-bd71-6b0656d6faf6