If you like city maps in the game Minecraft PE City of Democratia
then you will love it. The map consists of two towns that differ in size and they are connected by an underwater tunnel through which you can navigate using the trolley. The time needed to get from one city to another is equal to 1.5 minutes. In the cities, you'll find all the usual buildings, hospitals, schools and high skyscrapers to explore which are very interesting. In the city of Democratia (more) four hidden treasures that you will find.
On this map for Pocket Edition the emphasis is on urbanization so the surroundings of the cities look pretty empty there and you can hardly find something to do.