No person shall start a fire in the park except small fires for culinary purpose in park grills, or privately owned grills, or fires in the places or designated areas approved by the park district, except that the Director may, at his discretion, prohibit fires for limited periods at any location or for any purpose when necessary for the protection of park property. Any fire shall be continuously attended under the care of a competent person. All fires shall be put out by the person or persons starting or using the same before leaving the immediate vicinity of the fire. No fire shall be built within ten feet (10') of any tree or building, or beneath the branches of any trees or in any underbrush.