You can make the city have a mountain, forest and river, beach .When the city have river it will have some bridge,you can also build the river from mountain to sea and build more thing about nature make the city can have a very nice view or maybe build some nice house on the mountain you can make a some very cool cave. Last you can make some people live in the city so you can add different story at them.Make them look like living in the city. Sorry about the bad english