Completing these quests opens up a daily quest you can do when you return to Brunnhildar Village, though you don't get to do all of them every day. It seems only one or two of them are available per day, and which ones you get is random, like the Cooking daily quests. If they don't seem to be offering you a quest at all one day, you probably haven't unlocked the one that happens to be that day's quest. The following are the four quests you need to do first:
Hyldnir Spoils. Along with a few gold, you can either get a little bit of food/water, some snowballs, or you can get a super awesome mount (with a 1% droprate). Hmm, do I hope for the super worthless reward, or the super awesome one? Oh boy, I hope I get the food!