Hi there! Today I found a pretty nice survival island while typing in some random seeds. The seed is quite easy to remember and it spawns a small island with 2 trees and a ravine cutting through the ground.
The seed is the alphabet in lower case. abcdefghijklmnopqrstuvwxyz
Try it out on Hardcore and see how long you can survive! a1000xG
Interesting. There really is a ravine running through a pretty small island. Small but well-provisioned: clay, sand, grass, sugarcane, and a bit of exposed iron ore visible when looking into the ravine.
I wasn't trying to get a shot of the ravine, but accidentally screencapped it here:
The ravine is the dark jag between the two ponds on the left side of the shot. The single tree would have been on the right edge of this shot IIRC.
I took a slightly different approach with this survival island challenge, fishing aggressively instead of farming wheat. Had terrible luck with apple drops.
Then I put torches on the island and built a spawning room about 25blocks up (crude, I was about to quit this one as Cofirmed Survivable). One hostile mob drops to his death about every 10 seconds. Wheat wasn't cooperating much until skele bones started dropping from the splattering mobs.
There is an abandoned mine about Y=20 under the island. I think it's at the bottom of the ravine in a part that is not exposed to open sky. Lava nearby. Only found 4 diamonds and relatively little iron ore.