The cache is located in a standard ammo can that has been painted camouflage. The contents are "kid oriented" (i.e. a small Lego set, barrel of monkeys keychain, etc.). There is also a hitchiker on board that is just starting on its journey (A Laura Croft action figure- hey, my kid thought it was appropriate!).
NOTE: Make sure you park and begin your search on the recreation side of the park (it is the side with the lake- easily visible from the road). The other side of the park houses a museum, re-enactor camp, rebuilt revolutionary war buildings, etc.
Remember- the park CLOSES AT SUNSET. The rangers are pretty strict on this and will lock the gates. Plan accordingly.