Seed generates just a huge mushroom island, which is perfect for a good start to survival. Here you will have no problems with food for a very long time. In addition, if you dive under the water right next to the spawn point, you can stumble upon an underwater ruin with a chest. Inside you will find pretty good loot, among which there is an enchanted fishing rod.
How to use Huge Mushroom Island seed
Start the Singleplayer mode
Select ‘Create New World’
Then click on ‘More World Options…’
In the ‘Seed for the World generation’ field, enter 16000784105