But if you're visiting one of Indiana's state parks, the Indiana Department of Natural Resources has an important reminder: Please don't. However, Indiana State Parks says visitors are required to carry out artificial items rather than leaving them behind. The photo shared by Indiana State Parks makes the issue pretty clear. Indiana State Parks via Facebook attachment-leave-only-footprintsLeave No Trace When Visiting Indiana State ParksThe idea behind "leave no trace" is pretty simple. Read More: Additional 1400 Acres Added to Indiana State Parks SystemThere Are Other Ways to Make Your State Park Visit SpecialIf you're looking for something extra to add to your next Indiana State Park adventure, the DNR recommends stopping by one of its nature centers or attending a naturalist program.