So.. What more is there to do in Skyrim?

I've completed the Alduin-quests, the Dark Brotherhood-quests, the Thieves guild-quests and a shit ton of quests besides that. I'm going into the civil war now, but I feel a little...bored. Especially the Dark Brotherhood-quests were a pain with all the easy quests and running back and forth. Might this game (post Alduin) not be for me? Or is there anything more to look forward to?