Upon entering the world, which will be generated with this MCPE seed you will spawn on a small island in among of a great sea. There is nothing special on this island.
Exploring it you can find lots of different animals and several caves, one of which is quite large and interesting. Be careful in survival mode, because it is very deep. The most interesting thing in this seed is very beautiful and interesting mushroom Islands.
To get to them you have to turn left at the spawn location so that the nearest island was right of you. Then all you need is to swim straight until you see a beautiful mushroom island biomes.
First, you should find a small island, but if you continue the travel, you will find a large island with beautiful landscapes, long caves and unusual animals, that live on the island so long that they has become like the surrounding "mushroom" environment.