One of my favorite "excuses" for getting into the woods is scavenging campsites. I find that after major holiday weekends, and closing dates of hunting seasons are particularly fruitful. I gather up garbage left behind and take it to the dump, and find many useful, even expensive, things too. I've even found rifles, ammo, knives, stoves, lanterns, etc. not to mention miles of rope, fishing line, tent pegs and poles, and so on.
I turn the guns over to the authorities, who keep them for a few days then give them back or dispose of the through sales of surplus property, depending on the particular agency's rules. It's amazing how careless people are in the woods. I guess they are that way at home, too.