Hi Kenco
You would be wise to take out public liability insurance over the land to cover any accident, harm or damage to persons or property that might occur. As a landowner you automatically have, under common law, a duty of care to prevent harm or damage from occurring to people or property on your land. If an accident on your land results in harm or damage to a person or their property you could be sued. Insurance would cover this depending on the type & level of cover you have. If you are uninsured the incident may result in litigation against yourself which if successful,could compel you to 'pay up' from your own funds or assets.
Its' wise to insure.