Respect property. For example, farming or forestry machinery, fences, stone walls etc. Leave gates as you find them (open or closed).
Preserve the past: examine - without damaging - archaeological structures, old walls and heritage artefacts e.g. holy wells, mine workings, monuments.
Conserve the present: leave rocks, flowers, plants, animals and all natural habitats as you find them. Fallen trees are a valuable wildlife habitat; do not remove or use for firewood.
Avoid introducing non-native plants and animals e.g. zebra mussels in rivers and lakes.