Have you entered every buidling, read every mind? Made sure your lockpick skill is as high as possible right now? If so, you'll sure to be find A LOT of extra quests, loot and XP points. I'd highly recommend it, it's great fun.
I'd suggests you go and play now, discover the rest of the world, become a dragon and finish the game. Then start over again with a new type of character and EXPLORE everything, do every quest (whether it is 'good' or 'evil') and experience EVERYTHING.
That's how I'm doing it right now (lvl. 11 second character) and it's really fun. Gives you some reason to play again. =D
