There's really nothing I love better than a great fantasy story, complete with knights, dragons and elves. A great quest is usually required. Whether it is for a ring or whether it is to defeat an evil creature, it doesn't matter to me.
I love the sweeping drama, romance and scares. I love the fact that the fate of the whole, entire world rests with a few unlikely heroes. I just love a good quest.
My favorite quests have been found in The Chronicles of Thomas Covenant the Unbeliever by Stephen R. Donaldson and The Dark Tower series by Stephen King, although The Wheel of Time series by Robert Jordan is a very close second.