To find the cache you will first have to find this sign:
This area only has a few streets so you should find the sign okay, even in the dark. Start your search for the sign when you reach the coordinates given.
From this sign the actual cache is 790 Metres at a bearing of 59 degrees True.
I will leave it up to you how to get there but there is a couple of easy methods.
The cache itself is accessed by a public reserve.