The Easy Fix for Holding A Shark Fin For All of Act 4

Act 4 is awkward because you hold a quest item taking up space in your inventory, unable to find a use for it until the very end.

The easy fix is instead of finding the The Great White One when you go to Wakapanu Island the first time, you instead find traces of The Great White One to update the quest.

After the final act boss when you have to turn in the shark fin to Kaimana, she instead gives you a fishing pole, where you can return to the same 'pier' where the traces were and 'fish' up The Great White One to start the encounter.

Its hilarious!