Seed:-210665667690259296
Tested On:1.16 (Nether Update)..
Minecraft Edition:Java
Biomes:Desert, Ocean, Savannah, Mushroom Fields, Beach.
Natural Structures:Caves, Ravine.
Generated Structures:Shipwreck, Desert Temple, Ocean Ruins, Ocean Monument, Ruined Portal.
*the number of biomes, natural structures, and generated structures will increase as you explore the world (obviously).
Description:

You need to go the southeast to reach the Mushroom Island, but before you go to that biome, there are some generated structures you can found near your starting point. See all the 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: 195.500 65.00000 67.500
*may not accurate

Shipwreck # XYZ: 198.576 61.00000 150.931

Ruined Portal XYZ: 116.392 48.00000 202.096

Desert Temple XYZ: 314.534 70.00000 -138.322

Mushroom Island XYZ: 1176.509 66.00000 378.537

Ocean Ruins XYZ: 1280.385 68.00000 328.289

Ocean Monument XYZ: 1151.762 61.00000 718.512

Important Notes:

Mushroom Island is a little bit far from your starting point.

There is an area on the Mushroom Island where it connected directly to savannah. In that biome border, there are Ocean Ruins you can found.

Because the distance between the starting point is a little bit far from Mushroom Island. When you go to the Mushroom Island you may found new undiscovered generated structures along the way. This includes Ruined Portal, Ocean Ruins, or even Shipwreck.

Screenshots:

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