Seed:-7183173134896796824
Tested On:1.16 (Nether Update).
Minecraft Edition:Java
Biomes:Mountains, Ocean, Forest, Beach, Desert, Mushroom Fields.
Natural Structures:Ravine, Cave, Lava Pool.
Generated Structures:Ruined Portal.
*the number of biomes, natural structures, and generated structures will increase as you explore the world (obviously).
Description:

A pretty simple seed, what makes this seed special is that there is a Mushroom Island near the spawn point. Which is very rare to happen. Other than that, as you see on the title, there is also a Ruined Portal too. See all details down below.

I will continue to update this seed if a new version of Minecraft coming out. So stay tuned if you are interested in this seed.

Coordinates:

World Spawn Point XYZ: 221.500 63.00000 70.500
*may not accurate

Ruined Portal XYZ: 134.206 45.00000 5.381

Mushroom Island XYZ: -152.954 73.00000 113.176

Important Notes:

You just need to go straight to the west to get to Mushroom Island.

Since it across the sea, I recommend you to use Boat.

Screenshots:

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