Once i got the savage feeding perk i just ran around the land killing and feasting on any man or beast that was unlucky enough to cross my path, stopping at the occasional bandit hideout on my journey
This Perk was what allowed me to max out the Perk tree in one transformation. I ate humans in Windhelm and then took out every person I could find along the way until I got this Perk. One I unlocked it... anything that moved was prey.
3 cities, over 300 creatures eaten, nothing left living in a triangle made up of Whiterun, Windhelm, and Riften, all on one transformation.
It was actually kind of fun.