The Reality of our "Content"

Here's a great idea:

NPC: One in every town <Lita Lawless>
Repeatable Quest: Monster Extermination
Objective:
A monster hunter vial will be placed on your character that grants the ability to collect "Monster Goo" from the hunted monster.
Based on your level, you should go "The Map" to hunt "The Monster of your level". (this can be randomly generated, allowing players to venture to different parts w/o KSing)
Once the Vial is filled, return to Lita Lawless
Reward:
Upon return of the monster vial, Lita Lawless will reward 50% - 80% of the Exp required to level up.

Just an idea. There are of course many other ways to encourage players to go to different maps.