Where ever you ride please follow the code of conduct of the International Mountain Biking Association UK (IMBA-UK). This is recognised around the world as the standard to stick to.
Stick to bridleways, byways and other recognised routes. Avoid possible trespass on private land.
Wet and muddy trails are more vulnerable to damage. When the trail bed is soft, consider other riding options.
Inattention for even second can cause disaster. Excessive speed can maim and threaten people; there is no excuse for it.
Make known your approach well in advance. A friendly greeting (or a bell) is considerate and works well.
When passing horses, use special care and follow directions from the horse riders (ask if uncertain).
Know your equipment, your ability and the area in which you are riding and prepare accordingly. A well-executed trip is a satisfaction to you and not a burden or offence to others.