Okay, I know you have already seen a LOT of survival island seeds but today i'm here to show you one of my favorite seeds of all time.
I actually have had a survival world on this seed and it is by far the most interesting island seed ever.
Yep its really that simple and to top it all of you can find diamonds in the first day easily
The island is actually quite large so its not really a "challenge" as sorts.
You spawn at the South-Eastern part of the island but if you walk forward you come across a large ravine. If you look in the picture below it shows where it is and another shows what cave you have to go down. Once you are in there you just go down all the left caverns and you'll find your diamonds!
This has been my first post in about 3 years so ok.