Lost Tounge Overlook, The veiw in the day time is great, at night it's awesome. The whole of Blackreach, can't pick a favorite spot, which is why the Overlook is my single favorite...
Fair enough.
Outside of Blackreach, my favorite spot is the last quarter or so of the path leading up to Ivarstead... just past the troll cave.
Leaves are falling, you can see a waterfall off in the distance... if you look close enough you can see fish jumping out from the misty water spraying from a few currents of whitewater.
Just seems like a fisherman's paradise, love it.