The Vale of Eternal Blossoms, nestled at the center of Pandaria, is the last zone players will encounter while leveling. Unlike prior expansions, the Vale is a level 90 zone -- you won't really see any quest hubs open until you have hit level 90. Once you've reached max level, you'll find scores of daily quests to do for the various factions of the Mists expansion.
The Vale is also home to this expansion's two capital cities for the Alliance and Horde, perched on opposite sides of the valley. And those capital cities are complete with bankers, auctioneers, vendors, inns, trainers, reforgers -- just about everything you need for day-to-day errands and quests. This way, there's no real need to head back to the rest of Azeroth -- unless you're looking to farm some older content, that is. Because of the proximity to each other, the two cities guarantee you'll see members of both factions here and there, although it's definitely not a peaceful situation.
How to Get there?
The very short quest chain to open the Gate of the August Celestials begins at level 87 in Kun-Lai Summit at the Temple of the White Tiger. There, Xuen, the White Tiger, is hearing petitions to open the gate, but he has tests for members of the Alliance and Horde after the disaster at Serpent's Heart in the Jade Forest.
Over the objections of Taran Zhu of the Shado-Pan, Xuen accedes to Anduin's and Dezco's requests to open the gate. After A Witness to History, the gate is opened and adventurers can travel into the vale at their leisure.
The Vale is home to the Golden Lotus, who offer the majority of the daily quests available in the zone. Also based in the Vale are the Lorewalkers, who offer additional daily quests. The Vale itself is a picturesque valley, but it's being besieged by mogu, and you assist the Golden Lotus in thwarting the mogu's efforts as part of your daily duties.