On the story arc "Legends Adrift", there is a point when Sisipu invite you to her fishing hole (Spicey!) and she tells you she'll mark its location on your map. Thats a lie becuase I looked on the map and there is no mark anywhere.
Anyway so I headed back to the lighthouse that I escorted Sisipu to the first time we met, and just before you get there you'll see an underpass in the rock.
To find the fishing hole head down there and a cut scene will start when your through to the other side.
You cheeky little monky Sisipu! Now show me your fishing hole!