Denison, Tx has this --
Sec. 18-113. - Damaging, removing, etc., park property.permanent link to this piece of content
It shall be unlawful for any person to cut, pull, break, bruise, remove or in any manner injure any tree, shrub or vegetation of any kind growing in any city park or to injure, deface or in any way interfere with any chair, bench, seat or hydrant, frame, fence, gate or structure of any kind therein or thereon or connected therewith. This section shall not apply to anything done by the lawful employees of the city in the lawful performance of their duties, or under their authority or direction.
But really? Are we going out there with a huge shovel and digging big holes?
"I'm just picking up trash, last week my daughter got cut by a can that was sticking out of the ground, and I'm here to make sure that doesn't even happen again. Look at all this sharp stuff I already picked up." Then chuckle a bit and say "If I find any gold, (chuckle some more) I'll let you know (chuckle again)"