I don't bring or really use anything. I spend so much time staring at monitors that reading with a phone is more like work than entertainment. I've carried paperback books with me a few times, but it's not very comfortable lying in a tent trying to read them, so I didn't spend much time doing that and stopped bringing them.

I generally just sit in front of my campfire and ponder, look at the stars, listen to the forest, and relax until I get in my tent and fall asleep. But my trips are not very long, generally not more than 3 nights and by then I get bored with myself so I'm ready to come back.