Hidden in a hollow log, its a small plastic lunch-box in a fairly conspicuous and public location, so getting to it without being seen will be the main problem. I suggest you pretend to be taking photographs...
Parking is difficult - I'd suggest Lion Yard carpark, or along The Backs - but cycling or walking should be a pleasure on a nice day.
(I'm told there is also parking in the Lammas Land car park at approx N52 11.709 E0 06.865)
For centuries a 'men-only' bathing station existed here - passing ladies to avert their gaze please!
Here's a 360 degree panorama taken very close to the cache-site - which will help you not at all!
Please watch out for good old English stinging-nettles at the cache site... (Their stings are no more than a minor irritant - and might even be good for you!)