Very peaceful experience. I enjoyed the different sounds associated with various areas, hearing the water before I could see the stream over the hill, listening to the birds in the forest or the winds in the mountains. Didn't take long at all to generate a pretty impressive size landscape. Nice work!
I did notice that when trying to stand still on a mountain to take a screenshot that I would slip and slide around, even when it looked fairly stable/flat, but I was still able to get a good one: http://imgur.com/54k6RLA