One of the groups I follow actually have dedicated days (with volunteers) for going back to repair damage, they also make sure people who go there tidy up after themselves, it's not fair spoiling it for other people to enjoy, I don't want to save the planet but I think it's just rude not to tidy up your mess.
It will come back as next year they want to come back it will be closed due to litter problems - Please guys, tidy your mess up
I'm sure most of the members on here do anyways. In regards to me actually doing it - If i'm close to a bin or on my way back I'll take out a bag and just fill it, to be honest I've not seen that much litter to places I have been.