I haven't finished many of the questlines, civil war, the main line, Dark Brotherhood etc... but let me ask more experienced players, once you've completed all the questlines, what do you do? Or more to the point, what does a 1000th level character do at that point other than grind out more legendary levels?

Before that even happens, I've usually lost interest in that character, or I've taken to spawning 20 draugr deathlords in solitude....

After that I usually start playing with console commands(Summon 50 giants in Solitude just cause). When console commands get boring, I'll start a new character or take a break and play something else.

That's...what I used to do anyway. Dropped Skyrim awhile back.