Most seeds that spawn you on an island in the middle of the ocean leave you to try to fight for survival. This one may spawn you on some islands, but it gives you everything you need to not only survive but thrive too. You spawn on an island with building materials next to an island with food. Then a short swim away is a mushroom island biome full of food, caves, and asylum from monsters.
This seed spawns you on a tiny island in the middle of the ocean, but directly in front of you is a mushroom island. I’m sure if you travel around the ocean far enough, you can find more islands, but in this area, this mushroom island is your survival island. If you’re up for an underwater adventure, there are also two ocean monuments close by.
When you first spawn on this seed, you’ll be on a tiny island with nothing but some grass and dandelions. If you’re willing to do the swimming (or boating if you can find a tree to make a boat with), this seed holds much greater things than that, though. You can find a mushroom island (a very rare biome) and a savanna plateau M biome not too far across the ocean.
Usually, you have to go pretty far out into the ocean to find an ocean monument. In this seed, you can find one in a loch-like area near the land. Then as a bonus, there is a village on land with a blacksmith and some cool extreme hills nearby.
Jungles and mega taigas have some of the tallest trees in Minecraft. They also have other features that make them unique and cool to stumble upon. This seed has both of them close to each other so you can enjoy the benefits of both.