Maritime Update!

That's for the future, since 1.17 is in development. I'll try to be simple, fast, and combine as many vanilla features i can think of.

Usable Ships. Using an magical block, we can transform a ship(Built in blocks) in a real ship, were we can walk, store things, and transport players and mobs. That magical block can be crafted with a magical item that only be fin among loot. The ship will only become a usable ship if it has a certain shape and match some requirements.

Better loot. The loot of all structures in the game will be updated. That would be a perfect oportunity.

Island updated. Islands could have loot, villages or some natural interesting block or mob, that will make it fun to explore them.

Pirates, Pillagers or something, in ocean. Maybe we can find other ships, that will do pirate things, like rob, kill and destroy. Maybe we can also give a little update in the other pillagers?

Sea bosses. Bosses that can be basically the same, with some little variance, to make them "unique". They will be in enormous advantage if the player is in the water, so will be better if we fight them using the ships.