The cache is fake rock key container hidden somewhere in the quaint little park. There is a bench in the park, for you to sit on as you sign the log or try to figure out where the cache is hidden. The park has two entry points, connected by a sidewalk. The park is frequented by muggles, usually with dogs, so stealth is really needed.
There used to be a cache called 'Tradewinds Park' in this park that was archived due to it being muggled.
Watch out for snakes and other wildlife.
Good Luck!