It's pretty bad and I just don't get it.

I agree with 'why wait?' I take my young nieces and nephews out quite often and we always start with a sweep of the parking area or fishing spot. They are proud to make it look better for the next visitors.

If there are cans, I redeem them and use the money to buy beer for them. Hopefully they'll see the reward and continue doing this when they get to high school.