Friends of Copperfield Nature Trails likes these principles.

https://lnt.org/why/7-principles/

Link above goes into more depth and is from the Leave No Trace, Center for Outdoor Ethics

1. Plan ahead and prepare
2. Travel on durable surfaces (stay on designated trail)
3. Dispose of waste properly
4. Leave what you find
5. Minimize fire impact
6. Respect wildlife
7. Be considerate of other visitors