Safety is closely linked to the law.
According to the regulations in force in the Canary Islands, only a qualified tourist guide can guide throughout the territory and interpret its landscape and heritage. The law is clear. Check that your guide is not an intruder. You will have peace of mind, quality and safety. Demand their credentials. (link to the public access list of the Government of the Canary Islands Guides).
Remember, a Tour Guide must be clearly identified at all times, displaying his or her credentials in a clearly visible manner. This is their official ID card: