I got an idea of what you can do with fort knight, it would be fun to use the island for a boss battle, a boss that could fit well is a haunted pirate ship that would throw canon ball at player in the island. To make the boss more fun and interesting, the boss should turn around the island constantly to make player follow the boat and dodging the canon ball at the same time, at the end of the fight, the pirate ship throw a huge canon ball destroying the fort knight island. the destroyed island can be added as a new island named ruins island. to reach the boss battle player should get an item only obtainable when fishing (everywhere) ad use at a specific place (could be ruin island) to get teleported to the boss fight (it would teleport all the player around the one that used the item, and at the end of the fight player get teleported back just before fort knight get destroyed with a reward. I don't exaclty remember what fort knight is but if needed it would be cool to modify it a little to fit the boss battle.