I looked that hike up and it looks awesome. No navigation needed, except I'd fall off a bluff looking for fish! An absolute great place to smallmouth bass fish! I'd be hauling in all kinds of extra weight in fishing gear.
I understood the groundcloth was actually just a place to stand getting out of the hammock; the weight given is for a small piece of Tyvek. I always carry a small amount of extra food, there's been times when trips ran a little long because of inclement weather or injury. You can go hungry, or sometimes you can give yourself a little boost to get out of a bad situation. Usually some bars, or jerky.