You can get some easy exp and repeat this as often as soon as the respawn has happened.
You go to Blade's Edge Mountains between Ruuan Weald and Grishnath.
There in the tunnel between those 2 areas are many mobs and some neutral/friendly cenarion expedition guys which will help you.
Now just mount, gather some mobs and run back to your friends, which will help you kill the mobs.
Don't forget to damage each mob as you won't get any exp when they get killed only by your new friends. Easy done by a char which has AOE damage. If they are to far away try to kite them, freeze them in position (frost mage, hunter, or any other).
This will give you full exp for each mob with only minimal risk and minimal effort.
The only thing is the respawn time, which should be not too low and so easy going.
Good luck.