The Department of Agriculture is concerned about the unauthorised use of motorbikes within its plantations.
Regular organised events do take place in plantations around the Island, but they have been approved by the department, are insured and have been risk-assessed.
Minister Phil Gawne says the plantations definitely aren't open to all motorbike riders to use whenever they want:

Researching your Manx family history can be a very interesting and rewarding hobby. Trace your roots in the Isle of Man with our helpful of guide.