What Leave No Trace practices should backpackers do that they don't do?

The most important thing that we’d like to see more backpackers do is better pre-trip planning, i.e. making sure they know about the area they plan on visiting, the local regulations/conditions (particularly regarding to human waste disposal, food/trash storage, fires/stoves, etc.), any special concerns such as terrain, weather hazards, local wildlife concerns and group size limits. The better prepared a backpacker is, the safer his/her trip will be, the lighter his/her pack will be, and his/her overall impact can be greatly reduced.