For those wondering, the location was Bain Boeuf, Mauritius. See my explanation of the clues below.
Look south from the gunner’s cornerstone. Perhaps a river ran from the rampart many years ago. There:
Bain Boeuf is on the northern coast of Mauritius. From there, you can see an island called Gunner's Quoin (cornerstone in French). It is in the district of Riviere du Rempart (river of the rampart, basically).
C asuarina trees stand guard. Lots of Casuarina trees on Mauritius, and at Bain Boeuf beach.
I f I land here, I come on the wings of a Jefferies favorite: the kestrel. I land = island; Air Mauritius has a kestrel as their logo.
R emember, there is a Synergy to this place. It has become a Habit. This one stumped everyone. In the Seven Habits of Highly Effective People, Habit 6 is "synergy." In the chapter and movie about it, the author uses Mauritius as his example of synergy due to the way a very diverse population lives together so well.
N ot always a happy cloak to wrap around you here. "Not happy cloak" = unhappy cloak = unhappy cape = Cap Malheureux, next to Bain Boeuf.
E nigmatic Ozle is from a different place. Jokey reference to Ozle, who jokingly says he's from an island.
No one seemed to notice for awhile that these five lines' starting letters formed "Cirne," which was the original name of Mauritius.
Look from the corner and see the bath for a sacred animal for many here. That is what you seek.
Next to Bain Boeuf is the Coin de Mire Hotel, which is sort of hard to translate, but to me was Corner of the View or Look. Bain is a wash or bath, and the majority of Mauritius's population is Hindu. Hence the sacred bath.
In Dominion, like many things, Bold plays are Marin's language of choice.
All the bolded bits were translations of French words. Marin speaks French.
As a last Resort, Elements at Bay.
Elements Bay Resort is very close to Bain Boeuf.
In case anyone was wondering why I chose that spot -- I used to live there. It's a pretty amazing place.