Ocean Dream is a big ship made for MCPE.
Do you want to be in a boat? Better yet do you want to be in a big cruise ship?
This map gives you a big cruise ship for your entertainment.
You could explore the ship from top to bottom. There’s an endless room inside it with halls, ball room, restaurant, ship engine room and many more.
You could play survival and find stuff that you need to survive and spawn some zombies in it.
I said that but I’m not sure if MCPE could do command mode to spawn zombies.