[myth-simba]

Try a new island, Emerald island xD It had a volcano on it.
And every few minutes the island shakes like an earth quake. just for good effects.
And have npc battle boats (can be done) which guard the island trying to prevent people entering or leaving.

it would be good to see.
as on the island there is a quest for a hefty treasure. sinking those ships would also result in good treasures. all you need is a net (from easter) to bag up the fallen treasure from the destroyed ship, but be careful, the ship's work as a team and if one falls reinforcements be on it's way.

The island itself has many secrets, rigity caverns. the volcano is mainly for show but can be triggered in events by an admin to erupt and you could do an evacuation event. get off island asap!! and spawn npc shipsand monsters, make obstacles and so on.