This is in a small wooded area of the park, where my dogs ears prick up and his nose goes on radar, as there are lots of squirrels here, so be careful if you have a dog.
We love this park as its great for walks and a cheap day out.
Watch out for the guardians of this cache, they may throw some nuts at you 
The container, was described to me as a fake rusty bolt. Sallie think it looks more like a mushroom.