You are going to have to be careful that nobody sees you approach the cache area and ensure that, once found, the cache is rehidden with care, as there is high risk of it being muggled due to the popularity of this park.
The cache itself is a 2L tupperware style container, which contains the usual logbook and 'goodies'. It is hidden in a part of the park which seems to indicate to me that this was once a Victorian park, landscaped to be a romantic rustic wilderness (in a polite and well-groomed way, naturally!), hence the name.