An ides to make the seas more fun.
NPC Pirate ships that shoot cannons and have a bunch of souped up bonecrew mobs with like a 50% chance of a chaos chest on the ship.
There should be a mini boss that is the "captain" that must be killed for the door to be unlocked that reveals whether or not the pirates booty aka chaos chest is aboard requiring it be farmed. Have 3 areas in the sea that are like 6 or 9 tile radius where they'd patrol to increase player encounters. Hour cooldown perhaps.