Leave your campsite cleaner than you found it

That's the motto I try to live by.
Heidi and I rode through the Avenue of the Giants today, and are now camping in a CA state park.
When we were biking along, through 300 foot tall trees that are 1,000+ years old between Pepperwood and Redcrest along the Eel River, we saw a white pickup truck pulled off along the road with the operator enjoying the sunny view and taking one last slug on his canned beverage. Then he chucked it on the ground and got back in his truck. As we passed the guy and his truck we realized that he was a CA state park employee/ranger, driving a state truck.
So, you can imagine, when we got to Campground of the Stumps we laughed out loud at the Junior Ranger "Litter-Getters" poster. If only we had shown up before 4pm, maybe we could have signed up?