drugs - and yes I'm including caffeine, alcohol, nicotine, and that cough syrup your cousin buys by the case

our minds and the minds of those around us

I guess ultimately, we do.

People.

My first thought is novel things and events, but really that's not enough. That could just be a bunch of boring permutations of matter. What makes life interesting is things that reveal parts of you you didn't know exist or cause you to create them. Colorful things, metaphorically speaking.

A plan for something interesting

Pleasure

The unexpected and the unknown.