We loved everything about Pandora, and the Valley of Mo'ara (as the outside portion is called) was spectacular. At night, it's beautiful and so immersive. The combination of visuals and sound made me, for one, feel like I was on an alien planet! Quite a suspension of disbelief.
Try this: explore Pandora at night, then, just before closing time, get in line for one of the rides. You'll get to enjoy the land and a relatively short wait for the rides (especially Na'vi River, which might be a walk on by then).