For Minecraft Pocket Edition, “creed” is a nice seed. You spawn on a small island with caves and trees. There is another island within swimming distance. If you like survival island type worlds, this one should work.
When you spawn, survive on the island for a while. Then, go out to the end of the peninsula and swim straight from there. It will take forever. Make sure you stay straight. You will see land to your left, but don’t veer away from you path. Keep swimming or flying. You will soon come to a rocky tower and a cove. Keep going straight. Soon you will come to a large lake/river system with an island in the middle. Go right and cross the lake at a narrow point, then follow the lake until you get to this weird ice tower colony thing. I haven’t explored much farther than that. Enjoy!