We were kinda of dipping into this in another thread about who does and does not bring there keys with them. I have thumbed a ride back to the car a few times and i have to agree having a little money is a good idea for reasons like this but it seems like when your in the back country most people are so nice they usually wont accept the money anyway. But i think regardless is should be offered.
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Leave nothing but footprints
Take nothing but pictures
Kill nothing but time