So, for those that have hit level 50 and want to level other classes on the same character but don't want to do the dungeon or fate option, here's a little something that might interest you. If you have a lot of levequests saved up, you should do escort leve's since levequests now benefit from the armory bonus you get after you get at least one class to level 50. Remember, each character can play as all classes and you switch classes based on the item in your hand. This last bit was for those extremely casual players that may have forgotten.
Anyways, levequests in general are good xp but the escort quests(noted by the picture of a person riding a chocobo) are quick and easy.