The cache is hidden on the opposite side of the north point. In fact, it's not even that close to the point, however, it is out of the way so you shouldn't be seen by muggles unless they're far away. You will only be 25m - 50m from the Ao Wai Beach.
Please make sure you hide the cache as well if not better than you found it. Trust me, Thai people have a way of finding the most obscure locations and muggling caches. Thai people seem to go to places that are out of the way, sit and drink beer, break their beer bottles, litter, and just about anything else you can imagine. If this cache isn't covered up well enough, the locals will find it and muggle it.