Enter the cave and follow the map below.
There is spring water that fully recovers your HP/MP, revives KO'd allies, and removes all ailments.
Once you reach the pirate's hideout, cross the bridge to enter the pirate ship.
Head north and examine the steering wheel to trigger another cutscene.

Bestiary Checklist:

• [FFVPR-002]002. Steel Bat
• [FFVPR-003]003. Devil Crab
• [FFVPR-004]004. Stroper

Item Checklist:

• C-002: Leather Cap