We volunteered at Rocky Mountain Nat'l Park and on every picnic table there was a sign stating to not leave coolers or cooking stuff/food outside. Eat and put it away. Wouldn't you know that a camper left in the morning for an all-day siteseeing trip and left his cooler out. The ranger came by and took it in the ranger's office to be claimed. The camper came back after 10pm and knocked on our door asking what happened to his cooler. We explained the policy and that the ranger took it. The camper actually demanded that we call the ranger to bring his cooler back. We gave him the phone number. The next morning the camper packed up - with his cooler and a hefty fine. :)