Field day type antenna

I have a kenwood TS-820s, with matching tuner. I am going to the "high country" of east Oregon in a couple of weeks.....What can I do best with a hunk of wire, a 4000 foot moutain, 120 I have a kenwood TS-820s, with matching tuner. I am going to the "high country" of east Oregon in a couple of weeks.....What can I do best with a hunk of wire, a 4000 foot moutain, 120 VAC available, and a lot of tall trees ?? I know how get the wire up, but are there any ideas on how to feed the darn thing? Haven't been there yet, so I don't know the distance between trees, or the other variables.
I guess what I am asking is what do I take.