Wacky Waters

Minecraft, you should add bigger ravines and skinnier water ravines. Make the water more realistic such as it getting darker the farther you go and certain mobs can spawn at certain Y-levels and can only stay within a 15 Y-level range (cant go higher or lower than 15 blocks from where they spawn). For deeper parts you should make an item that you wear as a helmet that shines a light. The devs, expand on it however you like if you think there would be better ways to expand this idea