hmm, it is good that you make from a new map, but like what it is said, there will be border problems because, the corner of the maps is not equal, when in-game there will be border problems..
and also that water thing you were planning to use surf on is bad idea,
Come on, what kind of town has the water like that which only connect to a certain backyard??
your idea is there, but to be honest it looks bad, it just not only take up space it looks bad as well..
the mountain is too straight, make it look more natural, add more trees..etc.
and a ledge infront of a house??
and why is there rocks on the backyard when the mountain is far away while the other areas do not have rocks?
i think you have improve but could do better..:)