When you are done exploring the city, enter the Purple Wyrm (if you haven't already). It will state that you may complete the quest more than once. After the first time you do this, a quest note will appear on the character status screen.
This is a quick way to build levels if you have some excess cash. With each amount you pony up (the second is 4000 gold), you will get that amount of experience. You can repeat any of these quests immediately, provided you have the money. Allesia: Seek Huros inside the Church of the Helm for 2000 experience.