Personally I love the forests, in fact the first thing I am going to do (When I get a chance) is go wandering around for hours. Maybe do some hunting in the process.
So what about the rest of you? What about Oblivion do you love the most?
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The Sun and Moon transform day to night, but what transforms the mind? The best techniques are passed on by the survivors.
A while after first announcing it they said that one of their big things is that they were going to make ruins and such feature much more outdoors but looking from the demos that when a dungeon is indoor it is as dark and scary as possible.