I haven't seen this to be the case yet, so correct me if wrong...
But it would be cool if some islands were very well guarded and the only way you could get close or dock/anchor was to be what that hideout was for.
Such as a pirate legend. If you're not a pirate legend the hideout would be unfriendly to you and attack you visciously.
Maybe include a response ship that Sails from its port and can be sunk for additional achievements but are manned by NPC persons and can bail water so they are "higher level" content and ruins your standings/achievements with that hideout?
