A very simple way to add light to your camp site.
Wrap a piece of aluminum foil along any limb "nubs" on a side of a tree. If there is nothing to "grip" the paper, use a wire or string (with the foil wrapped around to protect it).
Form a pocket around the base of a candle to hold it in place. Angle the candle away from the tree slightly to avoid the risk of fire.
Be sure that there are no "tinder branches" immediately above the candle, nor on the forest floor immediately below, to avoid the risk of fire.