We already had a sea update, but like imagine if they made it more realistic and maybe added octopus and whales or something, and the deeper you go you find ALOT more shipwrecks or pieces of sea tech and things.
Also, what if they made like a deep dark sea biome? which is below the usual sea we explore, and the waters a really deep dark blue so you can barely see without any light assistance, and they could hide some scary sea creatures down there.
Also like, rafts would be cool or the ability to craft larger boats that could house 3-4 players instead of only 1 or 2.
..and seashells
who doesn't want seashells?