Im level 16 with my bosmer/scout and haven't even started the main quest, just finished a quest called ''unfathomable depths'' and it's far above any as my favorite quest in the game so far. Just wondering what others fav. quest's are. As far most rewarding quest goes its easily ridding riften of those dirty skooma dealers.

Oh and those dwarven ruins are amazing

Temple of Kyne, with the tree. Yeah, yeah, I know it says temple of Kynareth, but that's just Cyrodiilic cultural imperialism.
And spreading the love for Mara. Might not be the deepest quest, but it's nice to ignore the war and the world eater and all the face eating gribblies and just play cupid for a while.

sheogorath