I know that even last year we passed on a couple of sites that were not hammock friendly. I completely agree with your statements about being good stewards and taking care of campsites. I have yet to go to the BWCA and not haul out someone elses trash. Several years ago on CHerokee lake my brother and I spent an entire day cleaning the island site. When the "man in the green uniform" showed up he was coming to see how bad it was left as there was large group of kids there. My father says that it has gotten better since he started going in the 60's. I only takes a few to ruin it for everyone else. I can assure you that I take leave no trace very seriously.
I am a swimmer/snorkeler I have found some neat old stuff in the water along the shores. In long island lake there is an aluminum canoe on the bottom between an island and the main shore in about 25-30 feet of water. When I went down to explore is it had a couple of older 1980 vintage rods tied to the inside. Mostly I find old cans and jars and lures lots and lots of lures.
“Never argue with stupid people, they will drag you down to their level and then beat you with experience.”
― Mark Twain