I'm not going to try to critique the list since I have no experience in the locale or conditions you'll be in.

However, I agree - leave the clothespins behind. Instead, take that 50-foot cord (which, I assume, you were planning to use as a clothesline with those pins), fold it in half, and tie one doubled end to a tree. Then begin to twist the two cords; when you're done, tie the other end to a tree. Push whatever you're hanging up through the little twist-loops you've made - they'll hold it just as well as the clothespins would.