1.Wandering Merchant ship:So there is a wandering merchant in land,so why not add a wandering merchant in boat,with new ships and fishing rods from that wandering merchant boat.It comes every week.

2.Enemy Boats/ship:so there should be ships that can attack us in timeless tides ocean.

When everyone aboard the enemy boat/ship dies you can claim your treasure.

3.NPC/AI boats:So they can’t do much,just roam around,but in some cases,it crashes into you,and sinks,with you too.

4.How shipwrecks are created:So NPC/AI boats crashes into you,it should be like that,and creates a shipwreck.Also with Enemy boats/ships,if no one collects the loot in 1 minute and 30 seconds,it can sink,and you can just get it underwater.

Thanks for looking!