This rare seed will spawn you on an island with some trees, wolves, and a bit of sugar cane.
Seems like just another standard survival island, huh? Except this one also has an underwater stronghold right next to it!
There’s also two ocean monuments, one at at XYZ: 711 62 -281 and another at XYZ: 200 61 -217.
Tested in Minecraft 1.8.