I just want to mention, this mod is really worth taking a look at, I have been playing it since installing it into my game.
adds:
*a new landmass off the coast of Solstheim
*its own excellent main quest, with various side quests
*new, well-developed NPCs
*companions
*stunning scenary
If you are bored, or just want to try a new mod, definitely check this one out!
note: if you are running a lower level computer (as I am), you will likely need to lower your resolution if you want to move more than a metre at a time, but it is well worth it, and doing so does not affect the visuals all that dramatically.