Here's a word to the wise - be careful that you don't prematurely clear an area and **** up an entire quest line as a result.
I cleared a dungeon without thinking about it - just seemed like the thing to do. Later, a companion quest ended and it seemed like the following quest should begin, but it didn't. I checked the guide book, and it turned out that the next thing I needed to find was in the previously cleared dungeon, and one of the companions was supposed to accompany me on the quest. I went back to the dungeon and the thing I needed to find wasn't there. Entire companion quest line dead. ****. Normally there are safeguard if you do something like this, but apparently not this time.
So I lost about 8 hours of game time.