An NPC on the bridge to the NQ gate in Antonica gives the quest, Cru Somethingorother. You'll have to do circuits of different zones in a time limit. Antonica, Commonlands, Thundering Steppes, Nektulous Forest are the ones I know of so far. There are more, I think one is in the Feerrott, so you'll need to be a high enough level to gain access to finish this quest.