I got it, thanks dudes
At last I know where is the problem: the wounded pirate
As normal, after defeated pirates at beach, I wil see a wounded pirate with "!?" mark, he will tell me go to the cave. But I can't see him, nothing appear at this place. After read walkthrought on internet I tried restart game several times but does not work, I really discouraged.
And last night, I join game and I can see the pirate, finish the quest.
What happened? game bug or that is my best zodiac moment?