Mob spawners galore. Starting off on and island in the middle of the ocean with 2 trees and 2 zombie spawners just below you in an intricate cave system with multiple entrances from the ocean, perfect the the scuba diver in you.
Dessert to the southeast in it is a village with lava pools on the surface. Even more south is a jungle and just before that an abandoned mine shaft. Be careful though there is a spider spawner and a skeleton spawner in the mine shaft.