After spending many many hours chasing all over the world for 1 quest here, 1 quest there, doing my damnedest to avoid the evils of grouping, dungeons, and xp grinding the last few levels 45-48 I stumbled onto Un'Goro crater! Wow, what a wonderful zone. Almost every zone I've been in since 30 has been so packed with red wandering mobs (badlands, tanaris, searing gorge, blasted lands, and the worst of all The Hinderlands) that I'd almost given up on the WoW devs having any sense at all regarding zone design. Then I discover this wonderful place.
I have run through about 50% of the zone three times, and never accidentally aggroed a mob, let alone died. Most mobs seem to be statics, or at least few and far between enough that you can just avoid the patrollers by walking around them.
But this wasnt even the best part.
There are OODLES
http://www.thottbot.org/?f=q&cat=Un%27Goro%20Crater of quests here, and most of them dont even require killing anything. You run around the zone foraging things, crystals, plants, dirt, supples, etc. There are lots of kill quests too, and from what I am reading even more quests open up at 49 so I should be able to stay in this zone and get at least 3 levels, if not more. The only downside is there doesnt appear to be any inn, so you cant hearth back to the quest area, and its a LONG run from gadgetzan.
I think a bunch of the collection quests are available at 47, and in all seriousness could be done at level 1 if they let you, so I'd recommend anyone 47-50 go there. I cant wait to start all these quests and really explore the zone.
*I am an Alliance, Human Warlock but I'd be willing to bet this zone will be Crypt's Undead leveling guide, part 16*