x mountain at 13,000
you do realize that cross is a very short run and at high levels like that is going to take about 15 minutes. Also it will be little more than sneaking down the side and then making a death ferry to the other side for some more sneaking.
Actually I've never been in there higher than 8,000, but I did not enjoy that. There are tons more runs going right now which would be way more enjoyable.