Maximize crushing your enemies, seeing them driven before you, and hearing the lamentations of their women.

Paper clips

Fantastic answer, and the only correct one I see

https://www.decisionproblem.com/paperclips/index2.html

No, that's education: https://www.youtube.com/watch?v=zDZFcDGpL4U#t=7m40s

Minimise entropy, maximise knowledge, kinship, time.

Beauty.

Well, is the world more beautiful with mammoths, or without?

They do have lovely strawberry blonde hair.

Famously subjective.

Its the nearest neighbor to everyone's best interest and most interpretations are preservationist.