There is the option of being OP enough to wipe all the spawn campers, since mage snowstorming and cleric smiting with a +10 staff can pretty much wipe out everyone in 3 hits, unless theres some Op people gathering there, which almost never is the case since they are all busy spawn camping around your camp or spiking crystals. I can single-handedly wipe all the people on quest camps with a samurai, just spam those aoes and in no time they're dead. Also, if you're strong enough, you can intimidate those people and they won't attack you if they're alone. I would only use thief or mage for sneaking out, but if you're lower leveled then I would just go sticking to the map boundary until you get to your quest and then gallop using thief to the quest. I don't really suggest doing it at the end, since you're probably gonna be kicked before you finish your quest if you don't hurry or you are just starting your quest.