I always keep an eye out for cheap sacks of Grain, and carry a few with me in case I find a grain quest from a village.
My favorite quests are still rescuing imprisoned lords, because no one tells you to do it. If you want to give it a try, it's all on your own initiative.
Unless one of the noble ladies tells you to do it, that is, which is extra good because you get improved relations with a noble lady, which is fairly hard to come by otherwise.
I'd love to see more rescue quests, like rescuing maidens and that sort of thing. Also, more variation in them. Maybe sometimes you have to sneak out through a secret passage or something.