The Caveman Quest: Talus the caveman leader in Dun valley will gladly buy any animals you give him... hungry tribe and all.

The Prince Quest: You can Kill Vukub and give his corpse to the Prince of Dun valley, or vice-versa I think. (Kill the Prince and give his body to Vukub).

Letter Quest: If you take the letter written by the old baron in the Dun Fortress give it to Tolonar, the prince guy (aka his son). He'll thank you and give you 200 gold I believe, don't know about experience.