Just inside the wooden gate you saw on the right in the last picture:
Continuing up the hill through the wooden gate:
Just up the hill from the last picture and to your left: another entrance to a swamp with swamp gators only.
Did not move, simply rotated to the right...the new entrance to the town:
Just inside the archway from last screenie; looking to my left:
Moved forward a hair and turned to my right:
Pic before last? Archway to the left? Here's the immediate result:
Just past the last pic, looking to my left. This is Tortuga Graveyard...same access...step through the portal and lose your weapon.
Turned right 45 degrees (?) from last pic...here's more Tortuga: