Master the Summit
Master the Summit installs paths that allow you to easily traverse some of the steeper/rockier locations around Skyrim. To reach some of these locations in the vanilla version of the game you need to spam-jump. If you've done it, you know it can be tedious.
We haven't encountered every path but the few we have seen look great and don't take away from Skyrim's immersive experience.
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If you want to explore off the grid, you'll want to try this mod out today. It's a good one.