New Tunaria is what is left of the Everquest city of Felwithe. It's a stunning beauty among the areas of EverQuest 2.
The levels I'd recommend going there are the higher 50's. But, it's also recommended to bring a group since unlike in EQ no one is really welcome anymore in New Tunaria. Yes, that's right, is not a city anymore, but more of a hunting area. There are various spots though where shinies spawn for those that can't find a group quickly, so even while waiting for one there's something to do.
Once you gathered a group you can head straight in, there are two quests I'd recommend picking up as they will lead you all around that beautiful zone. Those two quests start in two towers which you'll easily find at the top from an examinable book. Once you picked up Devotion and Purification as they are called, head towards the Temple of Growth for a prayer.